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He ________ have been nervous because he didn't go straight in. A. ought to B. must C. should D

He ________ have been nervous because he didn't go straight in. A. ought to B. must C. should D. had to

The correct answer is:

B. must

The sentence would be:
"He must have been nervous because he didn't go straight in."

This is because "must" is often used to express a strong assumption or deduction about the past, suggesting that it is very likely that he was nervous.

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