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Look around when the street. A. across B. crossing C. crossed D. to be crossing

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Look around when the street. A. across B. crossing C. crossed D. to be crossing

Look around when _____ the street.

A. across B. crossing   C. crossed D. to be crossing

试题答案

B

解析:

. 当现在分词作时间状语时,前面可以加上when和while.