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标题: Help! 大全-04-12 [打印本页]

作者: chouliulu 时间: 2008-10-28 07:02 标题: Help! 大全-04-12

12. Most nations regard their airspace as extending upward as high as an aircraft can fly; no specific altitude, however, has been officially recognized as a boundary.

(A) as extending

(B) as the extent

(D) to be an extension（A）

(E) to extend

Why the answer is A not B?

作者: 3smoviesalon 时间: 2008-10-28 20:31

upward作adv修饰extend, the extent 是名词，副词怎么可以修饰名词呢？

作者: thumbwings 时间: 2008-10-28 20:51

upward是副词吧,应该修饰V,B为N

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