单项选择题

Every director needs an assistant that he can ________ to take care of problems that may occur in his asbsence.

A．count of
B．count for
C．count on
D．account for
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单项选择题
I don't think he is serious,________
A．do I
B．is he
C．don't I
D．isn't he
单项选择题
Do what you think is right, ________ they say.
A．however
B．whatever
C．whichever
D．if only
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