You should be careful when ______ (cross) the street in big cities.crossing本题考查动

游客2023-10-05 100

问题 You should be careful when ______ (cross) the street in big cities.

选项

答案 crossing

解析本题考查动词的用法。when引导的分句中缺乏主语，应为主句的伴随状态；主语为you，动词为cross，应用主动-ing形式。该句意为：在大城市过马路时你应小心。

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