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 beenB．couldn't have been 　
C．might not be 　D．should not be

B

解析試題分析： 考查否定猜測。我認為我在昨天的聚會上看到史密斯先生了。不可能，他正在希臘旅行，前天離開的。根據(jù)下方提到He is now on a business trip in Greece. And he left the day before  yesterday.可知是對過去的否定推測，couldn’t have done ,故選B項。
考點 : 考查否定猜測

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