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一I think I saw Mr. Smith at yesterday's party.一He__there. He is now on a busines

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一I think I saw Mr. Smith at yesterday's party.一He__there. He is now on a busines

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

试题答案

B

解析试题