We_finished our assignment when the teacher came to th door A had just had B have just had选哪个?

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We_finished our assignment when the teacher came to th door A had just had B have just had选哪个?
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We_finished our assignment when the teacher came to th door A had just had B have just had选哪个?
We_finished our assignment when the teacher came to th door A had just had B have just had选哪个?

We_finished our assignment when the teacher came to th door A had just had B have just had选哪个?
A.过去完成时
从句里when teacher came用了一般过去
而我们完成作业是在这之前,所以要推一个时态.

B吧、
这个都学过的!

A 从句是过去时.

B 是过去完成时,看都面的came就知道了