问题补充:
—— Hurry up. The bus is coming!
—— Oh, no, we mustn’t cross the street the traffic lights are green.
A. after
B. since
C. when
D. until
答案:
A. after
B. since
C. when
D. until
解析:考查连词。句意:快点,车来了。不,直到绿灯时我们才能过马路。After在……之后;since因为,自从;when 当。。时候;until直到……;这个题目中考查not…until 直到……才,所以选D 项。