How many of us ________, say, a meeting that is not important to us would be interested in the discussion?
A.attended
B.attending
C.to attend
D.have attended
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B解析根据句意：比如说，我们当中参加一个对我们毫不重要的会议的人会有多少人对这个讨论感兴趣呢？________, say, a meeting that is not important to us修饰How many of us做定语。与全句动作同步．