______ 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
______ 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
D
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。