单项选择题

One is not guilty until he ______.

A. has proved
B. has been proved
C. is proved
D. will be proved
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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
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
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