Also in 2025 Practice Test B English, question 54.
Question
In September 2016 the National Museum of African American History and Culture opened as part of the Smithsonian Institution, the museum is already the Smithsonian’s third most popular site. Experts say that they expect this newest Smithsonian facility to welcome nearly 4 million visitors a year. The museum features more than 30,000 objects, including Muhammad Ali’s boxing gloves and a dress sewn by Rosa Parks. A commemorative copy of the Emancipation Proclamation, written in 1863 during the presidency of Abraham Lincoln, is also on display at the museum.
Which part of the paragraph contains an error in sentence structure?
Select the one error.
On the test you click the words in the text; here, choose them below.
- AInstitution, the
- Byear. The
- Cobjects, including
- DProclamation, written
Show the answer
Correct answer: A
The question asks which part of the paragraph contains an error in sentence structure.
Choice 1: “Institution, the” contains an error in sentence structure. The comma between these two words creates a type of run-on sentence known as a comma splice because both clauses—“In September 2016 the National Museum of African American History and Culture opened as part of the Smithsonian Institution” and “the museum is already the Smithsonian’s third most popular site”—are independent clauses, and must be separated with either a period or semicolon. If a comma is used to join the clauses together, a conjunction such as and would need to be added after the comma [converting the comma splice into a correct compound sentence].
Choice 2: “year. The” is correctly constructed, with independent clauses on both sides of the period (“Experts say that they expect this newest Smithsonian facility to welcome nearly 4 million visitors a year” and “The museum features more than 30,000 objects, including Muhammad Ali’s boxing gloves and a dress sewn by Rosa Parks”).
Choice 3: “objects, including” is correctly constructed. The sentence is correct as written with the nonrestrictive prepositional phrase (“including Muhammad Ali’s boxing gloves and a dress sewn by Rosa Parks”) properly preceded by a comma.
Choice 4: “Proclamation, written” is correctly constructed. The sentence is correct, with the nonrestrictive participial phrase (“written in 1863 during the presidency of Abraham Lincoln”) properly offset by a comma on either side.
Question analysis
This sentence-structure question shows a short paragraph about the 2016 opening of the National Museum of African American History and Culture, with four short phrases underlined. On the test students click the one part that contains an error in sentence structure, and the long names and the commas in the paragraph can make every spot look suspicious.
- Grade level
- Grade 6 reading and task
- Compared with grade 7
- Below grade 7 Finding run-ons and fragments is taught before grade 7, and here students check four short underlined spots in one paragraph for a single error in sentence structure. Long institution names add reading load but no extra grammar.
- Estimated difficulty
- Straightforward: two steps or one careful reading.
- Thinking it demands
- Depth of knowledge 2, skills and concepts · mainly apply
- What makes it hard
- A rule that doesn't sound wrong moderate
- Complex sentences minor
- Every choice must be checked minor
- Evidence
- Answered from one paragraph or stanza
- Reading level
- Question and choices: about grade 10, 107 words.
- Corrected from the DOE handbook
- Two grammar terms in the explanation were corrected.
- Students, last 30 days
- Not enough answers yet to show (it takes 10).
Why it is hard, traps and wrong answers (shows the answer)
Why it is hard
Students no longer have to supply the fix, only find the faulty spot, so the question rests on recognizing a comma splice. The error sits in the first sentence behind a long museum name, while the phrases “including Muhammad Ali’s boxing gloves” and “written in 1863” look more suspicious to anyone unsure about phrases set off by commas. Testing each spot for a full sentence on both sides finds it quickly.
A rule that doesn't sound wrong moderate Working it out
A comma alone joins two full clauses at “Institution, the,” and because the long museum name delays the break, the comma reads as a pause rather than a missing period. (Connors & Lunsford, 1988)
Complex sentences minor Understanding the question
The first clause runs 19 words, most of them the museum’s name, so by the time “the museum is already” arrives it sounds like a continuation, not a new sentence. (Abedi & Lord, 2001; Freedle & Kostin, 1993; Messick, 1989)
Every choice must be checked minor Choosing the answer
Each of the four clickable phrases straddles a comma or a period, so students must check, at every one, whether the words on each side could stand as a sentence. (Embretson & Wetzel, 1987)
Strategy: Find the subject and main verb of each sentence and count how many complete thoughts it holds, then check whether the punctuation at each underlined spot suits what comes on either side.
Traps
- Fixes what isn't broken: Changes a part of the sentence that was already correct, while the real error stays; or, where the question asks which sentence has an error or should go, picks one that is correct and belongs.
The wrong answers, classified
B Fixes what isn't broken (Connors & Lunsford, 1988)
Suspects the break after “year” because two sentences meet there, though a period already separates two complete sentences correctly, each with its own subject and verb.
C Fixes what isn't broken (Connors & Lunsford, 1988)
Believes a phrase opening with “including” after a comma is a fragment, though it correctly attaches examples to “more than 30,000 objects” within a complete sentence.
D Fixes what isn't broken (Connors & Lunsford, 1988)
Thinks “written in 1863” cannot describe the copy without “which was,” though the sentence already has its verb “is” and the participial phrase is correctly set off.
What was corrected from the DOE handbook, and why
- Explanation: The DOE’s explanation of choice 3 calls “including Muhammad Ali’s boxing gloves and a dress sewn by Rosa Parks” a “nonrestrictive appositive phrase.” An appositive renames a noun; this phrase gives examples of the objects, and “including” followed by a noun phrase works as a preposition, so it is a prepositional phrase. The explanation of choice 4 calls “written in 1863 during the presidency of Abraham Lincoln” a “nonrestrictive clause”; it has no subject or finite verb of its own, so it is a participial phrase. The site now says “nonrestrictive prepositional phrase” and “nonrestrictive participial phrase.” Both parts are still correctly constructed, and the answer, “Institution, the,” is unchanged.
Working it out, step by step
Figure out what the question asks
This question asks you to find the one error in sentence structure. Sentence structure is how a sentence is built. On the test, you click the part with the mistake. At each part, ask: could the words on each side stand as a sentence?
Learn the rule: no comma splice
An independent clause is a group of words with a subject and a verb that can stand alone as a sentence. You can’t join two of them with just a comma. That mistake is called a comma splice. Example: I ran home, the rain started. Fix it with a period: I ran home. The rain started. You could also add and after the comma.
Test “Institution, the”
Before the comma: “In September 2016 the National Museum of African American History and Culture opened as part of the Smithsonian Institution.” That is a full sentence. After the comma: “the museum is already the Smithsonian’s third most popular site.” That is a full sentence too. Only a comma joins them, so this is a comma splice. Fix: put a period after Institution and start The museum with a capital.
Check “year. The” and “objects, including”
- “year. The” is correct. A period already separates two full sentences.
- “objects, including” is correct. A preposition is a linking word like with or for, and “including” works like one here. A prepositional phrase is that word plus the words after it. “Including Muhammad Ali’s boxing gloves and a dress sewn by Rosa Parks” is a prepositional phrase. It gives examples of the objects, and a comma correctly attaches it.
Check “Proclamation, written”
“Written in 1863 during the presidency of Abraham Lincoln” is a participial phrase. That is a group of words built on a verb form, here written, with no subject of its own. It tells when the Proclamation was written. Commas correctly set it off, and the sentence keeps its main verb, “is.”
Watch out: Phrases starting with “including” and “written” can’t stand alone, so they may look like errors. But each one is attached to a full sentence. That is correct.
Choose the answer
Only the first part joins two full sentences with just a comma. So the answer is A: “Institution, the” contains the error. On the test, you would click that phrase.
Why this answer and not the closest wrong one
“Objects, including” is the closest wrong answer, because the words after its comma can’t stand alone. But they don’t need to. That phrase only adds examples to a full sentence. At “Institution, the,” both sides are full sentences, so a comma alone is not enough.
More questions like this
The original DOE question
