His mother looked very tired，for she ___...

His mother looked very tired，for she _____ the house herself all day.

A．had cleaned

B．has been cleaning

C．had been cleaning

D．has cleaned

C 【解析】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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