Three years _____(have) passed since he came here.填什么?为什么?

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Three years _____(have) passed since he came here.填什么?为什么?
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Three years _____(have) passed since he came here.填什么?为什么?
Three years _____(have) passed since he came here.填什么?为什么?

Three years _____(have) passed since he came here.填什么?为什么?
个人觉得用has比较适合.首先因为three years 是作为一个时间整体来看,而不是复数时间,时间不可数,年才可数；所以用第三人称单数.至于是用现在完成时还是过去完成时,我们先看看从句,用的是过去式,而他来这里这个动作发生在前,所以主句时间应该在came之后,所以主句用现在时比较合适.楼上的解答had 的解答---如果用过去完成时,后面没有he came here的时候 也可以用,现在从句是一般过去时,所以用has比较合适.
ubme看解答的时候不要看等级啊,你看上面6级的那个完全就是不会的.反而我上面一个一级的都答对了.如果满意请取纳我回答吧谢谢.

have
因为"years"是复数. 第三人称复数在现在完成时用have.
后面的since提示了是从他到这里开始计算到现在,所以是现在完成时.

had,我用过去完成时解释这道题：首先had done表示过去的过去，就是过去的某一时间或动作开始一直延续到现在（延续性）。根据句子翻译：自从他来这里已经过去三年了，表示他的动作还在延续，从来到这里的那一刻算起一直到现在！

has,时间作为一个整体时，谓语用单三。since后接过去时，主句用现在完成时。一定对的！

Three years have passed since he came here. 完成式

have passed ~~不要相信偏听之言~

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