问题
选择题
Being examined twice a year，whether it is a car or a bus or a truck，is the rule that every driver _______obey in this city.
A．shall
B．can
C．ought to
D．need
答案
答案：A
这题考查情态动词的用法，shall表示“规定，命令，警告等”句意是：不管汽车、公共汽车、或卡车，每年检查两次是这个城市每个司机要遵守的规则。选A。