what were you doing when he came in?____ my mother with her housework.A.Helped B.Help C.Was helping D.Helping

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what were you doing when he came in?____ my mother with her housework.A.Helped B.Help C.Was helping D.Helping
what were you doing when he came in?____ my mother with her housework.
A.Helped B.Help C.Was helping D.Helping

what were you doing when he came in?____ my mother with her housework.A.Helped B.Help C.Was helping D.Helping
选D
前面省略了 I was

I was helping my mother with her housework. 用过去进行时表示正在进行的动作。

B

过去进行时,选D