问题描述：
She often keep the office clean when she was at work.中的动词要怎样变化才对
原题是he often -the office -when she was at work.
Akeeps；cleaned Bkept;cleaned Ckept;clean Dkeep;clean
原题是he often -the office -when she was at work.
Akeeps；cleaned Bkept;cleaned Ckept;clean Dkeep;clean
问题解答：
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