—Hey man. You can’t cross the street now. You have to wait the traffic turn green.—Oh s

问题补充：

—Hey, man. You can’t cross the street now. You have to wait the traffic turn green.

—Oh, sorry and thank you.

A. when

B. after

C. until

D. while

答案：

A. when

B. after

(答案→)C. until

D. while

解析：A项在……的时候；B项在……之后；C项到……为止，在……以前；D项当……的时候。句意“嘿，伙计。现在你不能穿过街道。在交通灯变绿以前，你必须等。C项符合题意。