题目内容：

is this the museum ____some friends visited the day before yesterday?的横线上为什么用that不用which?

优质解答

填that,因为这是一个it is ...that...强调句型,不能用which代替that,记住就好.还有一些主从句只能用that的情况,给你列举一下：常考的强调句结构是it 引导的句子.It is (was) 被强调部分+ that (who) + 句子其他部分....