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 on
B．count for
C．count down
D．count out
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单项选择题
By moving the radar beam around slowly in circles, we can ______ the surroundings.
A．explore
B．expose
C．exploit
D．expand
单项选择题
Now I regret ______ worked harder at school.
A．not to have
B．not have
C．not having
D．having not
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