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】
If there had not been a hard layer of rock beneath the soil
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if there had not been a hard layer of rock beneath the soil,
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