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  3. You ______ her in her office last Friday; she’ s been out of town for two weeks.

You ______ her in her office last Friday; she’ s been out of town for two weeks.

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问题 You ______ her in her office last Friday; she’ s been out of town for two weeks.
选项 A、needn’ l have seen
B、must have seen
C、might have seen
D、can’ t have seen
答案D
解析 本题测试虚拟语气。needn’t have done表示不必做某事，而实际上已经做了，含没有必要或浪费的意思。根据该题后半句她已经离开两个星期了，A错。B和C是对发生在过去的事情的一种推断，只是程度不同，因为是肯定形式，不合题意，也错。must have been的否定形式应为can’t have done，所以D正确。
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