According to school bus safety rules when a school bus stops on the road to or pick up st

问题补充：

According to school bus safety rules, when a school bus stops on the road to or pick up students, other vehicles behind it must stop to wait.

A. drop off

B. take off

C. pay off

D. turn off

答案：

(答案→)A. drop off

B. take off

C. pay off

D. turn off

解析：考查词组。Drop off 减少，下车 take off飞机起飞，事业腾飞 pay off付清 turn off关闭

句意为，根据最新的交通规则，当一个校车在路边停靠让学生下车或者接学生的时候，其他的机动车辆必须停止并且等待。