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
If Mary had not been badly hurt in a car accident, she ______ in last month’s marathon race．
A．Would participate
B．might participate
C．Would have participated
D．must participate
单项选择题
This is the book _______ I was telling you just now．
A．about that
B．in that
C．in which
D．about which
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