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    精英家教网 > 高中英语 > 题目详情
    His mother looked very tired，for she _____ the house herself all day.
    A．had cleanedB．has been cleaningC．had been cleaningD．has cleaned
    C
    考查完成进行时。根据关键词all day可知应该使用完成进行时。再根据上文的looked可知应该使用过去完成进行时。
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