问题
选择题
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
答案：C
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。