问题描述：
Our classroom is cleaned every day.我们的教室天天打扫.这里用is cleaned还是cleans?好象有些词不用被动的吧?
You must be careful when_________.过十字路口时,你一定要小心.怎么翻译?
You must be careful when_________.过十字路口时,你一定要小心.怎么翻译?
问题解答：
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