单项选择题

(As is known) to all, sometimes it is very (difficult) to (tell) the difference between technical English (from) everyday English.

A. As is known
B. difficult
C. tell
D. from

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单项选择题

It is useless ______ about this point now.

A. arguing
B. to argue about
C. to be argued
D. to argue

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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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