单项选择题

Almost two thirds of the land in the northwest areas of the country ______ suitable for farming.

A．are not
B．is not
C．can not
D．not being
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单项选择题
It is because she is too inexperienced ______ she does not know how to deal with the present situation.
A．therefore
B．all what
C．so that
D．that
单项选择题
In no case ______ forget the great help that they gave us when we were in trouble.
A．do we should
B．should we
C．we should
D．we do should
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