________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
C

句中缺少的是主語，分詞不作主語，故排除A、B項(xiàng)；從整個(gè)句子意思來看examine需要用被動(dòng)式且用其一般式即可。
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