Question

【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

Answer 1

【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。