问题补充:
twice a year, whether it is a car ,a bus or a truck, is the rule that every driver must obey in this city.
A. Examining
B. Examined
C. Being examined
D. Having been examined
答案:
A. Examining
B. Examined
(答案→)C. Being examined
D. Having been examined
解析:考查动名词用法。本句中being examined twice a year是动名词短语在句中做主语。动名词做主语表示经常性,习惯性的动作。句意:无论是轿车,公交车还是卡车,两年被检查一次是每个司机都必须遵守的规定。故C正确。