This is one of the rarest questions that ______ at such a meeting.

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问题 This is one of the rarest questions that ______ at such a meeting.

选项 A、is raised
B、are raised
C、has ever been raised
D、have ever been raised

答案D

解析 动词时态。首先根据句子基本时态为一般现在时以及句子中有到现在为止的含义,判断从句中的时态为现在完成时。其次,定语从句的先行词为questions,所以谓语动词也应随其相应变化为复数形式。
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