twice a year whether it is a car or a bus or a truck is the rule that every driver must

问题补充：

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

答案：

A. Examining

B. Examined

(答案→)C. Being examined

D. Having been examined

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