单项选择题

The new law will come into ______ on the day it is passed.

A．effect
B．use
C．service
D．existence
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单项选择题
He didn't ______ and so he failed the examination.
A．work enough hard
B．hard work enough
C．hard enough work
D．work hard enough
单项选择题
Scientists say it may be ten years ______ this medicine was put to use.
A．since
B．before
C．after
D．when
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