So many directors , the board meeting had to be put off.A. were absentB. been absentC. had

So many directors , the board meeting had to be put off.
A. were absent
B. been absent
C. had been absent
D. being absent

A. were absentB. been absentC. had been absent(答案→)D. being absent解析：可联系答.案.网客服索取。

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A解析运用排除法。抗日民族统一战线自成立之始就有阶级矛盾，最后由于国民党顽固派挑起内战而破裂，人民民主统一战线没有出现严重分裂，后来发展成为中国人民政治协商会议制度，在社会主义现代化建设新时期发展成为爱国统一战线。