________Beijing，an old and modern city，is developing rapidly．We are going to visit it ________third time．A.The，theB./，aC./，theD.The，a
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B解析分析：1)城市名称前不用冠词，如：Beijing(但：the city of Beijing)2)序数词前面用不定冠词，表示“又一”“再一”，如：We are going to visit it a third time．(又一次去，累计是三次)