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
网友回答
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。