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

题目

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

答案

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.