He told me he had had a breakthrough.这两had有什么作用?作什么成分?

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He told me he had had a breakthrough.这两had有什么作用?作什么成分?
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He told me he had had a breakthrough.这两had有什么作用?作什么成分?
He told me he had had a breakthrough.这两had有什么作用?作什么成分?

He told me he had had a breakthrough.这两had有什么作用?作什么成分?
had had 表示的是过去完成时.前面的had在这里是表示完成时的助词.后面的had 是have的过去式,作动词,和后面的 a breakthrough构成词组have a breakthrough
所以两个had是不一样的.

前面的是过去完成时的had done中的had,后面的是have breakthrough的过去分词形式