Is this the factory you visited the other day?
A. that B. where C. in which D. the one
A 将疑问语序还原成陈述语序时,从句中缺少宾语,用Which ,That, 或者省略
3. Is this factory some foreign friends visited last Friday?
A. that B. where . C. which D. the one
D 将疑问语序还原,会发现从句缺少先行词,补上先行词 the one
而且先行词在从句中做宾语,连接词可省略,所以D
4. Is this the factory ______ he worked ten years ago?
A. that B. where C. which D the one
B 同样,从句中缺少地点状语,用in which, where,或者省略