英语单项选择Is this museum --you visited two days ago?选项：A that ,B

1.答案：D.
2.翻译：这个图书馆就是你两天前参观过的那个（图书馆）吗?
3.
1）此类题目必须先把它还原成陈述句才能准确判断答案：
This museum is _____ you/I visited two days ago.
2）此句如果使用定语从句的话,必须先要保证主句的完整.
即主句为：This museum is ____.
定语从句为：____ you/I visited two days ago.
此时可以明显看出,主句缺少一个表语,而定语从句的关系词刚好代替这个表语(同时是先行词),并在定语从句中充当谓语动词visited的宾语,所以一定是关系代词（因为关系副词在定语从句中是充当状语的）.
3）则答案只能是D the one.
the one = the museum,在主句中充当表语,即主句为：This museum is the one.
而定语从句的已经被省略的关系代词that,代替the one/museum,在定语从句中充当visited的宾语.
即定语从句可以改写成：
(that) you visited two days ago
= you visited that two days ago
= you visited the one/museum two days ago.
4）如果选择答案ABC理解成定语从句的话,则主句的is后面缺少表语；
选择C理解成用where引导表语从句的话,则where作为副词,在表语从句you visited two days ago中只能充当地点状语,而不能做visited的宾语.