If someone falls off the ladder and gets seriously hurt you’d better leave him he falls

问题补充：

If someone falls off the ladder and gets seriously hurt, you’d better leave him he falls and try to get help.

A. before

B. when

C. where

D. what

答案：

A. before

B. when

(答案→)C. where

D. what

解析：考察地点状语从句。本句中的where引导的是地点状语从句，修饰动词短语leave him。句意：如果有人从梯子上摔下来受了重伤，你最把他留在摔倒的地方，再去寻求帮助。ACD三项与句意不相符。故C正确。