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  3. All flights______because of the terrible weather, they had to go there by train.

All flights______because of the terrible weather, they had to go there by train.

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问题 All flights______because of the terrible weather, they had to go there by train.
选项 A、having been canceled
B、had been canceled
C、having canceled
D、were canceled
答案A
解析 英语中两个或两个以上句子间一般都用连词来连接，以构成并列关系或从属关系，据此我们可以将B和D排除。A和C都是现在分词短语，和all flights构成独立主格结构，作原因状语，又因为cancel和all flights具有逻辑上的动宾关系，所以应用被动式。例如：The assembling of the machine completed，we started operating it．机器安装完毕，我们就开始操作。The wire well insulated，we can use it here．既然导线已经很好地绝缘了，我们就可把它用在这里。
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