（2008安徽,47）---Hurry up.The bus is coming.---Wait a minute.Don't cross the street _____the traffic lights are green.A
问题描述：
（2008安徽,47）---Hurry up.The bus is coming.---Wait a minute.Don't cross the street _____the traffic lights are green.A.after B until C while D after the traffic lights 是人行的还是车行的?
答
人行的.选B.
until.直到.