单项选择题

What we must do now ______ make a careful investigation on the circumstances.

A．are
B．is
C．is to
D．were to
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单项选择题
—Look! He s running so fast!—Hard to ______ his legs were once broken.
A．know
B．realize
C．find
D．imagine
单项选择题
We should be able to do the job for you quickly, ______ you give us all the necessary information.
A．in case
B．provided that
C．or else
D．as if
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