11．______，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

分析 候選人落座后，會議開始了．

解答 答案：A 考查獨立主格結(jié)構． conference不能作take的邏輯主語，排除C、D項；B項是一個句子，但前后兩個句子缺少連詞，也應是排除，只有A項正確，candidates作現(xiàn)在分詞短語having taken their seats的邏輯主語，從而構成獨立主格結(jié)構．

點評 此類問題的解答，首先要弄清楚獨立主格結(jié)構的構成，然后根據(jù)名詞或代詞與后面的形容詞，副詞，介詞短語，分詞，不定式等存在邏輯上的主謂關系選擇正確答案．

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