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 situation today is obviously quite different from ______ it was only 50 years ago.
A．which
B．what
C．when
D．such
单项选择题
The film ______ this Saturday.
A．is to show
B．is showing
C．shows
D．is to be shown
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