If I had had enough money,I should have boght it.

If I had had enough money,I should have boght it.

题目
If I had had enough money,I should have boght it.
句中的两个had had 有什么却别,请讲的详细点.
答案
这里是虚拟语气,前面的是语法的用法后面是有的意思(过去完成时)
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