单项选择题

We warned him ______ that.

A．not to do
B．doing not
C．to do not
D．not doing
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单项选择题
Look, the trees are fallen; there ______ a strong wind last night.
A．must be
B．should have been
C．must have been
D．could be
单项选择题
She tried to ______ him to give up the impractical plan.
A．persuade
B．tempt
C．attract
D．suggest
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