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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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
单项选择题
It is hard to avoid mistakes, ______ you correct them carefully, it will be all right.
A．In the case
B．As long as
C．Although
D．Despite
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