单项选择题

He expressed his ______ opinion at the meeting. A) single B ) personal C ) person D ) private
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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
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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