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You ____ her in her office last Friday; she's been out of to

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You ____ her in her office last Friday; she's been out of town for two weeks.
A.needn't have been B.must have been C.might have been D.can't have been
怎么看这里用不用虚拟呢?
D
选can't have seen
好像选项都打错了
整句意思:你上周五不可能在她办公室看到她了,她出城已经有两个星期了.这里can表可能性