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    (   ) 2. My mother was washing clothes        I  was cleaning the floor.

    A. while     B. when

    C. after     D. because

    2. A while表示两者对比。当我在擦地时，妈妈在洗衣。

    题目来源：2015仁爱英语同步练测考九年级英语全一册仁爱版 > Topic 3 What can we do at home to protect the environment?

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