She often keep the office clean when she was at work.中的动词要怎样变化才对

She often keep the office clean when she was at work.中的动词要怎样变化才对

题目
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
答案
这样的话选C
因为后面的从句“when she was at work"是过去式,主句和从句时态是一致的,那么主句也必然是过去式,排除了A D
然后Keep st.adj也是固定搭配,clean本身就是形容词.不能再加ED.那么最后选C
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