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

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：考查宾语从句。本题中的宾语从句where the emergency exit is是作为动词notice的宾语，where引导起这个宾语从句，并在句中作为表语。句意：当你进入大楼的时候，你一定要注意到紧急出口在哪里。故B正确。