单项选择题

The monitor ______ ill, we'd better put the meeting off.

A．is
B．has been
C．been
D．being
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单项选择题
The door was ______ and I could not see who she was talking to.
A．shut
B．shutted
C．shutting
D．being shut
单项选择题
The book ______ interesting, but it's very instructive.
A．can't be
B．may not be
C．should not be
D．might be
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