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问一下这两句英语句子He also noticed that some houses had had no deaths

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问一下这两句英语句子
He also noticed that some houses had had no deaths.
Scientists have had the theoies that rising temperatures could harm crops.
我想请问一下
第一句为什么连用两个had
第二句什么头一个have后面又加had
问一下这两句英语句子He also noticed that some houses had had no deaths
第一个是过去完成时,前一个had是助动词,后一个had是动词,因为这句话是用过去式写的,所以就用过去完成时
第二个客观存在的,所以用现在完成时