【題目】一I think I saw Mr. Smith at yesterday's party.

一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】考查情態(tài)動(dòng)詞。句意：——我想我昨天在聚會(huì)上看到史密斯先生了。——他不可能在那里。他現(xiàn)在正在希臘出差，前天就走了。couldn't+have+done表示對過去事情的否定推測，譯成“不可能做過某事”。故選B.

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