单项选择题

（）we need air and water, so do we need criticism and self-criticism.

A. Even though
B. So long as
C. Just as
D. Now that

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单项选择题
They looked both ways before （）the street

A. they crossing
B. cross
C. crossed
D. crossing
单项选择题
Soon he got （） his difficulties and succeeded.

A. across
B. away
C. over
D. through
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