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请教一英语难题-Why haven't you asked Lily to come here?-She was doi

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请教一英语难题
-Why haven't you asked Lily to come here?
-She was doing a project when I found her and she ___ it.
A.hasn't finished B.hadn't finished C.didn't finish D.wouldn't finish
答案为什么选A,
这个还用解释吗?
完成时啊,但是实际情况是她没有做完这个动作,所以是否定,并且一直在持续,所以是现在时,she是第三人称单数,所以是has.
这个就是你传说中很难的问题吗?