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

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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.

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.

问题在于，this 是和research center 边在一起的做了主语，这句话前面换成陈述句应当是：This research center is the one. 否则不可能在research center 前没有任何冠词。只不过是在这个基础上再加了where引导的定语从句。
不明白还可以再问。

1: A错。因为visit是及物动词，而where是副词，意思“在哪里，in some place”，所以不能做visit的宾语。试想，如果出现“visit in some place”显然是不对的，而应该把“in”去掉，即“visit some place”
2：B错。因为当引导定语从句时，that不能做句子的任何成分，所以它是可以省略的。而这里引导词在句中显然是做visit的宾语

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