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
It is no use ______ that you didn't know the truth.
A．pretend
B．to be pretending
C．pretending
D．pretended
单项选择题
______ round the city, we were impressed by the city's new look.
A．Taken
B．Taking
C．To be taken
D．Being taken
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