单项选择题

I'm sure he is up to the job ______ he would give his mind to it.

A．if only
B．in case
C．until
D．unless
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单项选择题
The reason for his failure is ______ he didn't work hard.
A．that
B．as
C．since
D．because
单项选择题
Don't let yourself get into bad ______.
A．hobby
B．habit
C．custom
D．profession
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