i think______(一定是）Jack that parked the car like that,for he is always doing so.为什么标答是it must have been

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ithink______(一定是）Jackthatparkedthecarlikethat,forheisalwaysdoingso.为什么标答是itmusthavebeenithink______(

i think______(一定是）Jack that parked the car like that,for he is always doing so.为什么标答是it must have been
i think______(一定是）Jack that parked the car like that,for he is always doing so.
为什么标答是it must have been

i think______(一定是）Jack that parked the car like that,for he is always doing so.为什么标答是it must have been
it 是形式主语,代后面的从句,原来形式是it must be,用了完成时

I think it must Jack that parked the car like that, for he is always doing so.

对过去事实的推测。。。那为什么是完成时 而不是it must bemust （只用于肯定句）根据具体事实所做的很有把握的主观肯定判断和猜测：
　　“一定----，肯定---”：
　　--- You have worked hard all day, you must be tired. （对现在事实的判断）
　　--- It’s dark. Mother must b...

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对过去事实的推测。。。

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MUST表肯定一定，而jack停车是过去并且已经完成，所以答案是it must have been

must have done表对过去的肯定猜测
注意should have done是本应该做了什么
详见高二情态动词语法

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