英语单选问题,请高手快速回答

题目

英语单选问题,请高手快速回答
How many of us___a meeting that is not important to us would be interested in the discussion?
A attended B had attended C.attending D have attended
选什么?我觉得最有可能选C,可是如果是这样,句末应该是“.”而不是“?”应为选C就是做定语,那么“How many of us attending a meeting”就是句中主干的主语,这就是个陈述句啊!

答案

答案为C.
句子的主干是：
How many of us would be interested in the discussion?
我们中有多少人会对这次讨论感兴趣?
中间部分为分词做定语修饰us,其中that is not important to us为定语从句修饰meeting.
整个句子的意思是：
参加一次对于我们来说不重要的一次会议,我们中会有多少人对讨论感兴趣呢?