People should not cross the street _____

试题详情及答案解析: People should not cross the street ______ the traffic lights turned green.
A. when B. until C. after; 答案：B; 试题分析：句意：直到交通灯变绿人们才能穿过街道。not …until，直到······才。结合句意，故选B。
考点：考查连词的用法。