单项选择题

In some eases, your instructor may tell you the topics ______ or may give you a choice of top. les to write about.

A. in advance
B. ahead of
C. above all
D. right away
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单项选择题
I purposely ______ from extending these observations to any length.
A. abstain
B. sustain
C. retain
D. detain
单项选择题
She took an umbrella with her for fear that ______.
A. it rains
B. it should rain C. it rained
D. it be raining
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