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—Shall we go out for a swim?
—Sorry, I can’t. I ______ housework for my mother now.

A．am doing

B．is doing

C．are doing

D．did

考查動詞時態。根據語境“我不能出去游泳，（因為）我現在正在為我媽媽做家務。”后有now.故用現在進行時。選A。

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