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
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单项选择题
______ in the college ______ I met Pro. John yesterday.
A. It was... where
B. When... that
C. It was... that

D. It has been... that
单项选择题
How did all these______
A. come out
B. come up
C. come across
D. come about
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