选D
前面省略了 I was
what were you doing when he came in?____ my mother with her housework.
what were you doing when he came in?____ my mother with her housework.
A.Helped B.Help C.Was helping D.Helping
A.Helped B.Help C.Was helping D.Helping
英语人气:412 ℃时间:2020-03-20 00:57:44
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