问题补充:
--Hurry up! The bus is coming.
--Wait a minute. Don’t cross the streetthe 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:until直到;after在……之后;while然而,当……时;since由于,自从……以来。句意:快点,公交车来了。——等一下,到绿灯亮时,再过街。结合语境可知选A。