◎ 题干
Many air flights _________because of the eruption of the volcano, in _______case, many passengers had no choice but to take a train.
A.had been cancelled; whichB.have been cancelled; what
C.had been canceling; thatD.have been canceling; where
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Many air flights _________because of the eruption of the volcano, in _______case, many passengers had no choice but to take a train. A.had been cancelled; whic…”主要考查了你对  【一般现在时】【将来进行时】【过去完成进行时】【过去将来时的被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。