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 raisedB.is raised D.have ever been raised这个选什么?请解释下

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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 raisedB.is raised D.have ever been raised这个选什么?请解释下
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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 raisedB.is raised D.have ever been raised这个选什么?请解释下
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.

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 raisedB.is raised D.have ever been raised这个选什么?请解释下
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