问题
选择题
All flights because of the snowstorm,we decided to take the train. [ ]
A.were canceled
B.had been canceled
C.having canceled
D.having been canceled
答案
答案：D
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All flights because of the snowstorm,we decided to take the train. [ ]
A.were canceled
B.had been canceled
C.having canceled
D.having been canceled
答案：D