Which word completes: The answer ________ that no one knows?

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Multiple Choice

Which word completes: The answer ________ that no one knows?

Explanation:
Subject-verb agreement with a singular subject is being tested here. The subject "The answer" is singular, so the verb must be the singular present form of to be: "is." That gives the natural sentence: "The answer is that no one knows," where the clause "that no one knows" explains what the answer is. Using "are" would mismatch number, "were" would be past tense, and "be" is the base form not used after a present-tense singular subject. So the best choice is "is."

Subject-verb agreement with a singular subject is being tested here. The subject "The answer" is singular, so the verb must be the singular present form of to be: "is." That gives the natural sentence: "The answer is that no one knows," where the clause "that no one knows" explains what the answer is. Using "are" would mismatch number, "were" would be past tense, and "be" is the base form not used after a present-tense singular subject. So the best choice is "is."

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