单项选择题

They looked both ways before ______ the street.

A. they crossing
B. cross
C. crossed
D. crossing
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单项选择题
I'll stick ______ the task until it is completed.
A. at
B. to
C. on
D. in
单项选择题
The children kept quiet ______ they should wake up their mother.
A. lest
B. so that
C. for fear of
D. in order that
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