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英语
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never once has the old couple quarreled with each other since they were married 40 years ago.
这个句子怎么理解,为什么用完成时态,
人气：167 ℃ 时间：2019-08-17 00:35:38
解答
这是一个固定句型,since did,have done 从句意上来理解,是从过去一直到现在,符合完成时.
就是从他们40年前结婚开始这对老夫妻之间从来没有吵过架.
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