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英语
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i had not understood the problem until he explained it.
我再理解,过去完成式不应该是 had exlained
人气：230 ℃ 时间：2020-02-09 03:53:16
解答
直到他解释后我才理解了这个问题.
这个主要讲的是not……until这个句型,“直到……才”
意思是：我先理解,没有理解.后来他给我作了解释.
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