单项选择题

Nobody can be set in motion without a force ______ on it.

A．act
B．to act
C．acting
D．acted
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单项选择题
The preparations for the trip will be ______ till next week.
A．put out
B．put over
C．put off
D．put up
单项选择题
It is important to ______ people with respect and understanding.
A．treat
B．attend
C．care
D．touch
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