单项选择题

He didn't ______ and so he failed the examination.

A．work enough hard
B．work hard enough
C．hard work enough
D．hard enough work
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单项选择题
He found ______ everybody know what had happened.
A．it necessary letting
B．it necessary to let
C．necessary letting
D．necessary to let
单项选择题
Children are always curious ______ everything they see.
A．to
B．for
C．on
D．about
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