one day Stuart was playing basketball _____he fell and broke his legA.until B.when C.after D.where
问题描述：
one day Stuart was playing basketball _____he fell and broke his leg
A.until B.when C.after D.where
答
选B
因为 这句话说的是当他正在打篮球的时候,他摔倒了伤了腿.这两个动作时同时发生的.