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
She is so ______ that she doesn't even know where Beijing is.
A．foolish
B．competent
C．innocent
D．ignorant
单项选择题
Grace ______ tears when she heard the sad news.
A．broke in
B．broke into
C．broke off
D．broke through
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