all flights ____ because of the heavy snows ,hunderds of people had to stay at the airport
题目
all flights ____ because of the heavy snows ,hunderds of people had to stay at the airport
A:have been caceled
B:having caceled
C:caceled
D:having been caceled
答案上说是独立主格，选C不可以么。 被动啊， 为什么选D呢？
答案
were delayed 被延迟
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