______, the conference beganA.The candidates having taken their seatsB.The candidates had taken their seatsC.Taken their seatsD.Taking their seats
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A解析试题分析：考查独立主格结构。the conference不是take their seats的逻辑主语，排除C、D；当非谓语的主语跟主句主语不一致时，要带上自己的逻辑主语，B项不是非谓语动词短语，排除B。故选A。考点：考查独立主格结构