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---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

试题分析:句意:--今天早上我在咸阳机场看见斯密斯先生了。--你不可能看见他的,他正在夏威夷度假。因为是对过去的事情的推测,所以用情态动词+have done,排除AD,还有斯密斯先生在夏威夷所以是不可能出现在咸阳机场的,所以是否定推测,用couldn’t have done“过去一定不会做了”,must have done是肯定推测,“过去一定做了”,所以选B。
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