问一下这两句英语句子He also noticed that some houses had had no deaths
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
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
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你能帮帮他们吗