单项选择题

English serves as a common tongue in countries ______ people speak many different languages.

A．which
B．why
C．where
D．that
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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
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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