超星 - Unit 7 语法单选10题 - 查题吧

单选题

Sorry I didn't hear the ring. I in the kitchen when you phoned.

A. must have been
B. must be
C. can be
D. could have been

单选题

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

A. needn't have seen
B. must have seen
C. might have see
D. can't have seen

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