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
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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
单项选择题
They are often ______ caring more about animals than human beings.
A．accused of
B．accused with
C．charged of
D．charged for
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