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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单项选择题
The monitor ______ ill, we'd better put the meeting off.
A．is
B．has been
C．been
D．being
单项选择题
They ______ us warmly and showed us to our rooms.
A．welcome
B．welcame
C．welcomed
D．welcamed
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