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.
never once has the old couple quarreled with each other since they were married 40 years ago.
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,
这个句子怎么理解,为什么用完成时态,
英语人气：668 ℃时间：2019-08-17 00:35:38
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