I don't know the man ____ siting there

问题描述:

I don't know the man ____ siting there
A that B who C which
which one is correct?Why?

你这个句子有点小问题:应该是:I don\'t know the man __ sitting there.本来三个答案都不对:这里答案可以为:who is或者“什么都不填写”即:I don\'t know the man sitting there.=I don\'t know the man who is...