问题补充:
—Hurry up! The bus is coming.
—Wait a minute. Don’t cross the street the traffic lights are green.
A. until
B. after
C. while
D. since
答案:
(答案→)A. until
B. after
C. while
D. since
解析:not...until…是“直到...才”表示直到某一时间,某一行为才发生,而在之前该行为并没有发生。根据句意应是“不要过马路直到交通灯是绿色的”,故选A.