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【题目】----Dave didn’t respond ________any of my emails.

----Something _______have happened to him.

A. on; must B. with; could

C. for; could D. to; must

【答案】D

【解析】考查介词和情态动词。句意:--我的邮件戴芙一封也没回复。--他肯定有什么事情。Respond to回应;must have done肯定做过,表示对过去情况的肯定推测。选D。

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