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

This is the only one of the rarest questions that ______ at 请问this is one of the problems that badly ______ this is one of the questions 空格 by many students. a:that hav This is the only one of the books that was written by Mr Gre This is the only one of the ancient customers that ( )down i 10.This is the only one of the books published This is the only one of these books that - worth reading Aha This is the only one of these books that ______worth reading This is one of the best books that ______ appeared this year [W7]This is the only means that I can think of,______ we can this is the --- that one can find at the market. this is the -----that one can find at the market.