All flights-------because of the snowstorm,many passenger had to take the train.

题目

All flights-------because of the snowstorm,many passenger had to take the train.
A.had been cacelled B.have been cacelled C.having been cacelled D.to be cacelled

答案

C
“many passenger had to take the train”是完整的句子,不缺少任何语法成分,所以前面的“All flights-------because of the snowstorm” 不可能是完整的,或是正常的句子,C 或D；
C是完成态,D是将来态,所以结合起来,应该是选c