题目内容：

__ twice a year ,whether it is a car or a bus or a truck,is the rule that every driver must obey
A.Examining B.Examined C.Bing examined D.Having been examined
为何选C

优质解答

答案是C being examined .正常语序Being examined twice a year is the rule that every driver must obey in this city,whether it is a car or a bus or a truck.动名词做主语,有表达被检查的意思....