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    19、---- 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

    19、A

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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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