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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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