【題目】----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】考查介詞和情態(tài)動詞。句意：--我的郵件戴芙一封也沒回復(fù)。--他肯定有什么事情。Respond to回應(yīng)；must have done肯定做過，表示對過去情況的肯定推測。選D。

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