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 houses built of brick last longer than______built of wood.()

A. one
B. that
C. ones
D. those
单项选择题
You’ll have to pay for the holiday in ______ ，Tom．
A．front
B．advance
C．ahead
D．forward
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