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    --Why? Tom, your shirt is so dirty! --Mum, I my storeroom downstairs. A. cleaned B. have cleaned C. was cleaning D. have been cleaning 【查看更多】

     

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    —Why? Tom, your shirt is so dirty!

    —Mum, I ________ my storeroom downstairs.

    A. cleaned　　　　 B. have worked　　  C. was cleaning    D. have been cleaning

     

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