twice a year whether it is a car or a truck is the rule that every driver must obey in th

问题补充：

twice a year，whether it is a car or a truck，is the rule that every driver must obey in this city.

A. Examining

B. Examined

C. Having examined

D. Being examined

答案：

A. Examining

B. Examined

C. Having examined

(答案→)D. Being examined

解析：此题考查非谓语动词。Being examined twice a year系动名词短语的被动形式作了句子的主语。