来自董彦非的问题
allflights____becauseoftheheavysnows,hunderdsofpeoplehadtostayattheairportA:havebeencaceledB:havingcaceledC:caceledD:havingbeencaceled答案上说是独立主格，选C不可以么。被动啊，为什么选D呢？
allflights____becauseoftheheavysnows,hunderdsofpeoplehadtostayattheairport
A:havebeencaceled
B:havingcaceled
C:caceled
D:havingbeencaceled
答案上说是独立主格，选C不可以么。被动啊，为什么选D呢？
