If there had not been a hard layer of rock beneath the soil 这句话为什么要用过去完成时呢?
they would have completed the job in a few hours.
人气：166 ℃ 时间：2020-05-20 00:06:30
解答
这是表示与过去事实相反虚拟语气在条件状语从句中的动词形式【had+过去分词】,不是过去完成时,尽管形式一样
不信你接着看后面的主句,里面的动词形式就是【would + have + 过去分词】
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