twiceayear，whetheritisacarorabusoratruck，istherulethateverydrivermustobeyinthiscity.A．ExaminingB．ExaminedC．BeingexaminedD．Havingbeenexamined

Question

________twice a year，whether it is a car or 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

Answer 1

C

句中缺少的是主语，分词不作主语，故排除A、B项；从整个句子意思来看examine需要用被动式且用其一般式即可。