Clay,which was just below the surface of soil in certain clay-rich areas has to be dug up by a digger.对于这个句子后半部分的has to be的结构不明白, 为什么可以这样用语法结构? 它的意思是主语也是clay,但这样直接

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Clay,which was just below the surface of soil in certain clay-rich areas has to be dug up by a digger.对于这个句子后半部分的has to be的结构不明白, 为什么可以这样用语法结构? 它的意思是主语也是clay,但这样直接在上个句子前加has to be dug up无法理解其逻辑

被动句.be 过去分词.被挖.