单项选择题

I didn't see her in the meeting-room this afternoon. She ______ at the meeting.

A. mustn't have spoken
B. shouldn't have spoken
C. needn't have spoken
D. couldn't have spoken
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单项选择题
New ideas sometimes have to wait for years ______ they are fully accepted.
A. when
B. before
C. after
D. where
单项选择题
Bill assured his boss that he would ______ all his energies in doing this new job.
A. call forth
B. call at
C. call on
D. call off
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