A. You needn’t have seen her in her office last Friday; she's been out of town for two weeks.
B. You shouldn’t have seen her in her office last Friday; she's been out of town for two weeks.
C. You can’t have seen her in her office last Friday; she's been out of town for two weeks.
D. You mustn’t have seen her in her office last Friday; she's been out of town for two weeks.
C
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