Tom’s school was on the other side of the road, so he was told to watch out for cars when______the street.

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问题 Tom’s school was on the other side of the road, so he was told to watch out for cars when______the street.

选项 A、crossing
B、cross
C、crossed
D、to cross

答案A

解析 考查状语从句的省略现象。当状语从句的主语和主句的主语一致,且从句中含有be动词时,可以省略状语从句中的主语和be动词,即题中从句中的crossing为he was crossing的省略。故选A。
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