---I saw Mr. Smith at Xianyang Airport this morning.  
---You ____. He’s still on holiday in Hawaii.
A.can’tB.couldn’t haveC.mustn’t haveD.needn’t
B

試題分析:句意:--今天早上我在咸陽機(jī)場看見斯密斯先生了。--你不可能看見他的,他正在夏威夷度假。因?yàn)槭菍^去的事情的推測,所以用情態(tài)動(dòng)詞+have done,排除AD,還有斯密斯先生在夏威夷所以是不可能出現(xiàn)在咸陽機(jī)場的,所以是否定推測,用couldn’t have done“過去一定不會(huì)做了”,must have done是肯定推測,“過去一定做了”,所以選B。
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