单项选择题

It is extremely urgent that they ______ from the mountain before dark.

A．must be rescued
B．should rescue
C．can be rescued
D．be rescued
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单项选择题
At no time ______ what was happening.
A．the President was aware of
B．the President was aware about
C．was the President aware of
D．was the President aware on
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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