单项选择题

Professor Wang works in our city as a researcher. It will be two years since he ______ here.

A．left
B．stayed
C．came
D．lived
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单项选择题
Doing homework ______ most of the children's spare time, so they have little time to play.
A．gives up
B．takes up
C．puts up
D．brings up
单项选择题
______ both sides accept the agreement will a lasting peace be established in this region.
A．Unless
B．As long as
C．If only
D．Only if
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