This is the only one of the rarest questions that ______ at

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This is the only one of the rarest questions that ______ at such a meeting.
This is the only one of the rarest questions that ______ at such a meeting.
A.has ever been raised C.are raised
B.is raised D.have ever been raised
这个选什么?请解释下原因.

D吧就是在众多被提出的问题中 that是修饰questions 所以排除AB 然后是在已经被提出的问题中应该是完成时

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