Is this research centre is full of modern equipment you always mention.A. whereB. thatC.

问题补充：

Is this research centre is full of modern equipment you always mention.

A. where

B. that

C. the one that

D. the one where

答案：

A. where

B. that

(答案→)C. the one that

D. the one where

解析：这题考查句子成分，this research centre是主语，is是系动词，横线后面是句子，所以句子缺少表语，填the one代替the research centre，另外定语从句中缺少主语所以关系代词用that而且不能省。选C。