Is this research center you saw the modern equipment last year?A. whichB. thatC. the one w

问题补充：

Is this research center you saw the modern equipment last year?

A. which

B. that

C. the one where

D. the one that

答案：

A. which

B. that

(答案→)C. the one where

D. the one that

解析：考查定语从句。本题的主语是this research center,原句缺少表语，后面的定语从句也缺少先行词，故the one在句中既做表语也做了先行词，后面的句子很完整，所以使用关系副词，先行词指地点，故使用where,故C正确。