I’m not sure whether this is the room she left her dictionary.A. whereB. thatC. whichD. i

问题补充：

I’m not sure whether this is the room she left her dictionary.

A. where

B. that

C. which

D. in that

答案：

(答案→)A. where

B. that

C. which

D. in that

解析：定语从句中当先置词是表示位置的词语且没有限制性修饰语时，引导词要用where，故选A。