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标题: 请教nn一道语法题...谢谢:) [打印本页]

作者: vict2006 时间: 2007-1-19 16:36
标题: 请教nn一道语法题...谢谢:)

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

C to be an extent

D to be an extension

Eto extend

B为什么不行?

作者: abort 时间: 2007-1-20 02:32
http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=22920看看前辈的讨论

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