, the conference began.
A. The candidates having taken their seats
B. The candidates had taken their seats
C. Taken their seats
D. Taking their seats
网友回答
(答案→)A. The candidates having taken their seats
B. The candidates had taken their seats
C. Taken their seats
D. Taking their seats
解析：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。