完成时里的宾语从句应该接什么时态?比如现在完成时,假如我说He has not shown that he________ a better candidate.应该用什么时态才对?

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• 完成时里的宾语从句应该接什么时态?比如现在完成时,假如我说He has not shown that he________ a better candidate.应该用什么时态才对?
• for 一段时间一般与完成时一起用,SAT中有没有严格要求呢?我遇到的题目是这样的,(For) more than a century,wooden ships called skipjacks were (regularly used) (to harvest) oysters in Chesapeake Bay,but only a few (such vessels) remain in service today.个人认为应该改for,因为我觉得were应该是过去式,error
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