A.where B.that C.the one that D.the one where

题目

A.where B.that C.the one that D.the one where
Is this research center——you visited the modern equipment last year?答案为什么选D ,A 为什么不行.

答案

关键在于能否把题干正确转换为陈述句,有人把它变为：
This is research center _________ you visited the modern equipment last year.
这是错误的,因为research center前没有冠词the,定语从句修饰先行词,先行词被限定,应该有定冠词或者其他限定词.
应变为：This research center is _________ you visited the modern equipment last year.
这样主句缺少表语,就要用the one,而且先行词在从句里作地点状语,所以用where,结果就是the one where,因此答案选D.