—Why? Tom, your shirt is so dirty!—Mum, I______my storeroom downstairs .

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问题 —Why? Tom, your shirt is so dirty!—Mum, I______my storeroom downstairs .

选项 A、cleaned
B、have worked
C、was cleaning
D、have been cleaning

答案D

解析现在完成进行时表示从过去某时到现在一直在进行的动作。

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