单项选择题

The plan for unity under a federal system ______ into effect in 1782.

A．put
B．got
C．went
D．set
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单项选择题
We'll make no ______ between the terrorists and those who harbor them.
A．division
B．comparison
C．difference
D．distinction
单项选择题
He actually didn't see the man ______ the room, but he heard them ______ in it.
A．to enter, laugh
B．enter, to laugh
C．to enter, laughing
D．enter, laughing
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