单项选择题

Parking is a big problem, ______.

A．the traffic is so
B．is so the traffic
C．so the traffic is
D．so is the traffic
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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
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
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