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20、Sharon was supposed to be here at nine o'clock.She ______ about our meeting.

A.would have forgotten                               B.should have forgotten

C.ought to have forgotten                              D.must have forgotten

20、D

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Sharon was supposed to be here at nine o'clock.She ______ about our meeting.

A.would have forgotten                               B.should have forgotten

C.ought to have forgotten                              D.must have forgotten

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