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外语
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.
admin
2009-01-05
82
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,和田all flights 构成独立主格结构,作原因状语,又因为cancel和由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
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0
专业英语四级
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postscript
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设区域D由曲线r=1+cosθ(0≤θ≤π)与极轴围成,则二重积分
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