______, 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
A

試題分析：考查獨立主格結(jié)構(gòu)。the conference不是take their seats的邏輯主語，排除C、D；當非謂語的主語跟主句主語不一致時，要帶上自己的邏輯主語，B項不是非謂語動詞短語，排除B。故選A。
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