语法与词汇
All flights________because of the heavy fog, they decided to change their schedule.
A、
had been canceled
B、
were canceled
C、
having been canceled
D、
have been canceled
【正确答案】
C
【答案解析】
句意：由于浓雾所有航班都被取消了，因此他们决定改变行程。本句已有主谓宾，缺非谓语动词， 故A、B、D三项均可排除。
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