the one =which?

1. Is this museum ___ you visited a few days age?
A. where B. that C. on which D. the one

选什么，解释一下

选D，首先要把这个疑问句变为陈述句，即：This museum is—— you visited a few days ago. 从中可以知道这个定语从句少了个修饰词，所以要用the one 来代替this museum，至于引导词，由于the one 在从句中是宾语，所以引导词可以省略。