单项选择题

How to evaluate the performance of students is still a problem that troubles many professors（）

A. examine and judge
B. assist in
C. enhance
D. account for

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No one would have time to read or listen to an account of everything（）going on in the world.

A. it is
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单项选择题
It is not an agreement ______, but it will serve as one.
A. on such
B. for such
C. as such
D. in such
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