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【题目】I think I saw Mr. Smith at yesterday's party.

He ______ there. He is now on a business trip in Greece. And he left the day before yesterday.

A. mustn't have been B. couldn't have been

C. might not be D. should not be

【答案】B

【解析】考查情态动词。句意:——我想我昨天在聚会上看到史密斯先生了。——他不可能在那里。他现在正在希腊出差前天就走了。couldn't+have+done表示对过去事情的否定推测,译成不可能做过某事”。故选B.

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