题目内容
【题目】All flights ______ because of the snow-storm,many passengers could do nothing but take the train.
A.were canceled
B.having been canceled
C.had been canceled
D.have been canceled
【答案】B
【解析】前后两句之间没有连词,主语也不同,故判断前一句是独立主格结构,故选B项。
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