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They saw that she had to have blood.

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They saw that she had to have blood.
had to have 是什么时态,还是因为是had to do的用法,
另外,还在阅读书上看见两个have have连用的情况,请问这是什么用法,
They saw that she had to have blood.
这个句子中应该是短语have to do的用法,意为必须做某事,因为主句中动词saw是过去时,因此宾语从句中用had
have have连用的?能给个具体例子么?had had 连用倒是有,就是过去完成时