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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单项选择题
A good writing ______ clear organization and choices of words.
A. calls on
B. calls for
C. calls up
D. calls off
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
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