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。