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A
be
B
to be
C
being
D
to have been
正确答案 :C
解析
本题主要考察知识与能力—独立主格。
独立主格结构本身不是句子,主要用于描绘性文字中,其作用相当于一个状语从句,在句子中作状语,表时间、原因、条件、伴随、目的及状态等。There being + N./ Pron. 为独立主格结构,C选项符合题意。句子翻译为“没有什么要讨论的了,会议提前20分钟结束”。
故选C。
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