many directors__,the boat meeting had to be put off.

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many directors__,the boat meeting had to be put off.
So many directors__,the boat meeting had to be put off.
A.were absent B.been absent C.had been absent D.being absent
选D 详细说明下为什么 3楼的解释还是不太明白

确实选择D 如果是A或C 一定要加引导词：Because(of) so many directors...,so the boat meeting...
B不符合语法规则,所以选择D,既然此处没有原因引导词because,那么我们就需要在谓语动词be上加上表示同时发生的ing,句子就完整又正确了.

many directors__,the boat meeting had to be put off. So many people___,the meeting had to be put off.选B many people(being)absent,the meeting had to be put off ; we had to put the meeting off. so many representatives_ ,the conference had to be put off _____ ； we had to put the meeting off. so many students __,the test had to be put off The sports meeting is put off./ is to be put off. the flight had to be put off----------the thick fog It____heavily,the outing had to be put off. it ____heavily the outing had to be put off. We had to put off the sports meeting _______ the heavy rain.