I did not understand the problem.He explained it.请用until把两句连在一起可是书上的原句是这样的:I had not understood the problem until he explained it.为什么是had not understood 呢

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I did not understand the problem.He explained it.请用until把两句连在一起可是书上的原句是这样的:I had not understood the problem until he explained it.为什么是had not understood 呢
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I did not understand the problem.He explained it.请用until把两句连在一起可是书上的原句是这样的:I had not understood the problem until he explained it.为什么是had not understood 呢
I did not understand the problem.He explained it.请用until把两句连在一起
可是书上的原句是这样的:I had not understood the problem until he explained it.为什么是had not understood 呢

I did not understand the problem.He explained it.请用until把两句连在一起可是书上的原句是这样的:I had not understood the problem until he explained it.为什么是had not understood 呢
有两个动作,我理解和他解释
根据先后顺序,我再理解,
或者,按照not until来翻译,
就是,直到他解释了,我才理解
所以,就是你的答案
I had not understood the problem until he explained it.

I did not understand the problem until he explained it to me.

I understand the problem until he explained it,.

I did not understand the problem unil he explained it.