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
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单项选择题
We warned him ______ that.
A．not to do
B．doing not
C．to do not
D．not doing
单项选择题
I don't know him, but it is ______ that he is a warm-hearted person.
A．talked
B．said
C．told
D．spoken
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