【題目】_______ the street, don't forget to watch the traffic lights.

A. While crossing B. While crossed

C. While being crossing D. While be crossed

【答案】A

【解析】試題分析：句意：當你正在穿過街道的時候，不要忘記觀看交通燈。本題考查while引導(dǎo)的時間狀語從句，如果主句的主語和從句的主語是相同的，那么從句的主語和be動詞可以省略。故選A。

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