—— Hurry up. The bus is coming! —— Oh no we mustn’t cross the street the traffic lights

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。