The experiment lacked a proper control group _______ the results cannot be considered conclusive.
1
readingWhich choice completes the text so that it conforms to the conventions of Standard English?
A
group, therefore
B
group therefore,
C
group; therefore,
D
group: therefore,
Correct Answer: C
Choice C is the best answer. This question tests punctuation with conjunctive adverbs.
- Context clues: Two independent clauses connected by "therefore."
- Meaning: Use semicolon before and comma after conjunctive adverbs.
- Verify: "The experiment lacked a proper control group; therefore, the results..." is correct.
💡 Strategy: Use semicolon + conjunctive adverb + comma between independent clauses.
Choice A is incorrect because a comma before "therefore" creates a comma splice. Choice B is incorrect because it lacks the semicolon before "therefore." Choice D is incorrect because a colon doesn't precede conjunctive adverbs.