单项选择题

I don't think you've heard of him before, ______

A．have you
B．haven't you
C．do I
D．don't I
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单项选择题
Voices were ______ when the discussion became more heated.
A．risen
B．raised
C．shouted
D．improve
单项选择题
I didn't see her in the meeting room this morning, 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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