1.Is this museum __D_ you visited a few days age?
A.where B.that C.on which D.the one
the one 在这里是先行词,后面省略了 that.从这句子的陈述句可以看出来
This museum is the one that you visited a few days ago.
2.Is this the museum __A__ the exhibition was held.
A.where B.that C.on which D.the one
the museum 在这里表示地点,用关系副词 where.