The boy ____ we saw yesterday is Betty's brother.能用whom填空吗?为什么只用that/who,不能用whom?

分类: 作业答案 • 2022-04-13 16:29:29

问题描述：

The boy ____ we saw yesterday is Betty's brother.能用whom填空吗?
为什么只用that/who,不能用whom?

答