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    24．----- Catherine, everyone was at the two-hour concert except you. ----- Sorry, but I my mother clean up the whole apartment. A．was helping B．helped C．had helped D．am helping 【查看更多】

     

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    ---- Catherine, everyone was at the two-hour concert except you.

    --- Sorry, but I _____ my mother clean up the whole apartment.

    A．was helping      B．helped      C．had helped       D．am helping

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