Sharon as supposed to be here at nine o’clock, she ______ about our meeting.

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问题 Sharon as supposed to be here at nine o’clock, she ______ about our meeting.

选项 A、would have forgotten
B、should have forgotten
C、ought to have forgotten
D、must have forgotten

答案D

解析 must have done表示估计,且是估计已经发生了的事情。should/ought to have done表示应该做而没有做的事情,而would have done表示将要做而没做的,多用在虚拟语气中。
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