once every two years, whether it is a car, a bus or a lorry, is the rule that all drivers

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A. Having been examined
B. Examined
C. Examining
(答案→)D. Being examined
解析：考查动名词做主语，whether it is a car, a bus or a lorry,是插入语，暂时现不看，可以看出is是谓语，前面的是主语，a car, a bus or a lorry和examine是被动关系，用动名词的被动作主语，句意：不管是汽车，公共汽车还是货车每年检查两次是我们国家司机必须遵守的规定。选D。