◎ 题干
All flights _____because of the snowstorm,we decided to take the train instead.
A.were canceled B.had been canceled
C.having canceledD.having been canceled
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“All flights _____because of the snowstorm,we decided to take the train instead.A.were canceled B.had been canceled C.having canceledD.having been canceled…”主要考查了你对  【独立主格结构】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。