So many people___,the meeting had to be put off.选B

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So many people___,the meeting had to be put off.选B
A were absent B being absent Cbeen absent D had been absent 为什么不能选A 这是一个什么成分

B
本题考查非谓语动词.
不能选A的原因是从句没引导词,如改成：Because/As so many people were absent,the meeting had to be put off.就可以了.
So many people being absent为独立主格结构,非谓语动词作状语时要求其逻辑主语和主句主语保持一致,本题由于不一致,故用独立主格结构.

So many people___,the meeting had to be put off.选B many directors__,the boat meeting had to be put off. so many representatives_ ,the conference had to be put off many people(being)absent,the meeting had to be put off so many students __,the test had to be put off ; we had to put the meeting off. _____ ； we had to put the meeting off. so many directors being absent the board meeting had to be p so many directors being absent,the board meeting had to be p So many diretors being absent,the board meeting had to be pu The sports meeting is put off./ is to be put off. the flight had to be put off----------the thick fog