单项选择题

The instructor had gone (over) the problems (many times) (before) the students (will take) the final examination.

A. over
B. many times
C. before
D. will take
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(As is known) to all, sometimes it is very (difficult) to (tell) the difference between technical English (from) everyday English.
A. As is known
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C. tell
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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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