单项选择题
What we have to take ______ the courses offered only for this term.
A．are
B．is
C．have been
D．has been
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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
The plant is dead. I ______ it more water.
A．will give
B．would have given
C．must give
D．should have given
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