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If you don't know the meaning of the word,you can look it up in the dictionary 关于don't
don't为什么不可以用didn"t啊?
人气：436 ℃ 时间：2019-08-21 17:52:29
解答
不可以,这是个条件句,从句部分用一般现在时就可以了,从句子意思上理解可能更容易：如果你不懂...,说的是如果,还没发生,不需要用过去式didn't的
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