The flight ____ because of the snowstorm,many passengers could do nothing but take the traina.had been canceled b.have been canceledc.were canceled d.having been canceled选D 怎么分析?WHY?

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• 英语 非谓语动词的题目All things ___ because of the snowstorm, many passengers could do nothing but take the train.(1999.1) A. had been canceled B. have been canceled C. were canceled D. having been canceled 为什么前三个选项是谓语动词,D是非谓语动词?前三项不是非谓语动词么？为什么？
• the fights ________because of the snowstrom,many passengers could do nothing but take the train.A.had been canceled B.have been cancled C.were canceled D.having been caneled 为什么选D
• All flights _________ because of the snowstorm,many passengers could do nothing but take the train.A.had been canceledB.have been canceledC.were canceledD.having been canceled
• The flight ____ because of the snowstorm,many passengers could do nothing but take the traina.had been canceled b.have been canceledc.were canceled d.having been canceled选D 怎么分析?WHY?
• 3.All flights _______ because of the snowstorm,many passengers could do nothing but take the train.A) had been canceled B) have been canceled C) were canceled D) having been canceled 为什么选择B?独立主格结构不是选D吗?
• 1.All flights ___ because of the snowstorm,many passengers could do nothing but take the train.A.had been canceled B.have been canceled C.were canceled D.having been canceled 该选哪个呢,为什么.
• All flights _________ because of the snowstorm,many passengers could do nothing but take the train.A.had been canceledB.have been canceledC.were canceledD.having been canceled
• All flights () bacuse of the snowstorm ,many passengers could do nothing but take the train .A had been canceled B have been canceled Chaving been canceled Dbeing canceled .答案选第三个为什么啊,