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 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 |
试题答案
B
解析试题