i _____my homework when my mother came back home.a,had done b,was doing 这里 ,如果把b改为 had finished 就是对的,

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i _____my homework when my mother came back home.a,had done b,was doing 这里 ,如果把b改为 had finished 就是对的,
i _____my homework when my mother came back home.
a,had done b,was doing
这里 ,如果把b改为 had finished 就是对的,

i _____my homework when my mother came back home.a,had done b,was doing 这里 ,如果把b改为 had finished 就是对的,
是的 你说的是对的

是的

a、b 两个都对!

其实从语法下来讲
A和B答案都是对的
只是时态不一样
A;过去完成时,表示在我母亲回来之前,我已经把作业做好了。
B;过去进行时,表示我母亲回来的时候,我正在做作业。

很少用过去进行时了。完成时倒是经常用,无论是过去完成时还是现在完成时。

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