So many representatives______, the conference had to be put off.A、were absentB、

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问题 So many representatives______, the conference had to be put off.

选项 A、were absent
B、to be absent
C、being absent
D、had been absent

答案 C

解析本题考查独立主格结构。句子后半部分的主干结构完整，前后两分句没有连词，所以前半部分只能用非谓语动词形式。representatives与be absent是逻辑上的主谓关系，且动作已经发生，所以be absent应该用现在分词形式，此独立主格结构充当原因状语。

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A--conferenceagendaB--thedailyagendaofac