All the flights ______ because of the snowstorm we had to take the train instead.A.were c

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All the flights ______ because of the snowstorm, we had to take the train instead.

A.were canceled

B.had been canceled

C.having canceled

D.having been canceled

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。