单项选择题

It is a small country, yet has a lot of ______ resources.

A．potential
B．unknown
C．secret
D．unlimited
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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
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
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