Extract:
What punctuation is needed in the following sentence to make it correct?
Dr. Levine could not answer all of our questions she promised to research the topic and return with a recommendation the next day.
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A
Colon
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B
Question mark
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C
Comma
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D
Semicolon
A semicolon is needed to connect the two independent clauses "Dr. Levine could not answer all of our questions" and "she promised to research..."
A) Colon
Colons introduce lists, explanations, or elaborations following independent clauses—not connections between two equally weighted independent clauses. Using a colon here would imply the second clause explains the first, which it doesn't.
B) Question mark
Question marks terminate interrogative sentences only. This is a declarative statement—not a question requiring interrogative punctuation.
C) Comma
A comma alone creates a comma splice—joining two independent clauses without a coordinating conjunction. Both segments can stand alone as complete sentences, violating standard punctuation rules.
D) Semicolon
Semicolon correctly joins two closely related independent clauses without a coordinating conjunction. Both clauses express Dr. Levine's response to unanswered questions, making them logically connected yet grammatically independent—exactly the scenario requiring semicolon punctuation.
Conclusion
Semicolons properly connect independent clauses that are closely related in thought but lack coordinating conjunctions. This sentence contains two complete thoughts requiring either semicolon connection or period separation—making semicolon the grammatically precise internal punctuation choice.