英语高手请进,下面的这个选择题,请仔细分析每个选项正确或者错误的...英语高手请进,下面的这个选择题,请仔细分析每个选项正确或者错误的原因,最后给出正确答案.All flights （）because of the terrible weather,they had to go there by train.A:having been cancelledB:had been cancelledC:having cancelledD:were cancelled
问题描述：
英语高手请进,下面的这个选择题,请仔细分析每个选项正确或者错误的...
英语高手请进,下面的这个选择题,请仔细分析每个选项正确或者错误的原因,最后给出正确答案.
All flights （）because of the terrible weather,they had to go there by train.
A:having been cancelled
B:had been cancelled
C:having cancelled
D:were cancelled
答