单项选择题

If you don't know the meaning of the word, you simply can ______ a dictionary.

A. make out
B. go over
C. look up
D. refer to
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单项选择题
My sister's professor had her ______ her paper many times before presenting it to the committee.
A. rewrite
B. to rewrite
C. rewrote
D. rewriting
单项选择题
In recent years special attention has been paid ______ developing the students' productive skills.
A. over
B. to

C. on
D. in
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