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They saw that she had to have blood.

来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/05/17 07:28:03
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,
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