never once has the old couple quarreled with each other since the_英语解答

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：493 ℃　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.