SAT OwlWhen the Pantheon in Rome was completed around 125 ______ its concrete dome was the largest in the world. Nearly 1,900 years later, it remains the largest unreinforced concrete dome ever built.
Which choice completes the text so that it conforms to the conventions of Standard English?
CE;
CE
CE,
CE:
Show answer and explanation
Answer: C
"When the Pantheon in Rome was completed around 125 CE" is an introductory dependent clause. A comma separates it from the main clause "its concrete dome was the largest in the world."
Choice A uses a semicolon, but a clause starting with "when" cannot stand on its own as a sentence.
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