Question

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

A．which

B．that

C．the one where

D．the one that

Answer 1

C

 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。