______________ twice a year, whether it is a car, a bus or a truck, is the rule that every driver must obey in this city.
| A．Examining | B．Examined |
| C．Having been examined | D．Being examined |
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______________ twice a year, whether it is a car, a bus or a truck, is the rule that every driver must obey in this city.
| A．Examining | B．Examined |
| C．Having been examined | D．Being examined |
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