he doesn't know ______about it

问题描述:

he doesn't know ______about it
20 - 离问题结束还有 14 天 23 小时
he doesn't know ______about it
为什么答案是 to whom to talk
为什么whom前用to

如果没有to,这个句子就是he doesn't know whom to talk about it
那么我反问一下,为什么用whom?
很明显吧~~应该用who这里,所以如果用whom,那么前面加上to也就不奇怪了~~