单项选择题

The committee ______ among themselves for four hours.

A．has been arguing
B．has been argued
C．have been arguing
D．have been argued
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单项选择题
This kind of mowing machine differs from the other ______ it is more powerful.
A．in that
B．now that
C．so that
D．on condition that
单项选择题
If only I ______ not so nervous at the important interview.
A．was
B．has been
C．be
D．were
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