I don't know the man ____ siting there

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 sitting there.
有问题,你说话,我出力!哈哈

I don't know the man who is sitting here.
I don't know the man that sits here.

I don't know the man sitting there.
I don't know the man who is sitting there.
确实是正确答案
A、B、C三个选项都不对！

A
NO WAY

A

A

A
这句话不缺少任何成分,三个答案中只有that可以省略!

这种题目别做了，漏洞百出，误人子弟