Tom's school was on the other side of the road, so he was told to watch out ...

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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 whent __________he 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．可以省状语从旬中的主语和be动词，即题中从句中的crossin9为he was crossing的省。故选A。

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