How many of us ________,say,a meeting that is not important to us would be interested in the discussion?

问题描述:

How many of us ________,say,a meeting that is not important to us would be interested in the discussion?
A.attended B.to attend C.attending D.have attended 请问选谁,为什么?
我想知道为什么.

选C
首先,say可以不看,只是个口语的插入语
attending a meeting
其实原句是.of us who attended the meeting
题目用了定语从句的简单形式的规则,去掉who,动词变ing