单项选择题

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

A．count of
B．count for
C．count on
D．account for
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单项选择题
No sooner had I closed the door than somebody started knocking ______ it.
A．on
B．with
C．to
D．for
单项选择题
If you don t put the milk in the refrigerator, it may ______.
A．go by
B．go off
C．go on
D．go back
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