The classroom is crowded with children have poor eyesight, all of interested in painting.

The classroom is crowded with children have poor eyesight, all of interested in painting.
A. who; whom
B. that; whom
C. who; them
D. that; who

A. who; whomB. that; whom(答案→)C. who; themD. that; who解析：考查定语从句和独立主格结构。第一个定语从句的先行词是children,定语从句中缺少主语，用who指代先行词在句中做主语。第二空横线后面没有系动词，说明该部分不是一个完整的句子，就不能使用定语从句的关系词了，故排除ABD三项。Them指代前面的children作为of的宾语。句意：教室里挤满了视力很差的学生。他们中的所有人都会画画很感兴趣。故C正确。

我也是这个答案