You must notice the emergency exit is when you enter the building.A. whichB. whereC. what

问题补充：

You must notice the emergency exit is when you enter the building.

A. which

B. where

C. what

D. in which

答案：

A. which

(答案→)B. where

C. what

D. in which

解析：答案：B考查宾语从句。句意为：当你进入大楼时，必须要留意紧急出口在哪儿。此处是where引导的宾语从句。故B项正确。