— Why? Tom your shirt is so dirty!— Mum I my storeroom downstairs。A. cleanedB. have wo

问题补充：

— Why? Tom, your shirt is so dirty!

— Mum, I my storeroom downstairs。

A. cleaned

B. have worked

C. was cleaning

D. have been cleaning

答案：

A. cleaned

B. have worked

C. was cleaning

(答案→)D. have been cleaning

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