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

游客2024-07-23  18

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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