Most nations regard their airspace as extending upward as high as an aircraft can fly; no specific altitue, 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 e) to extend
肯定是a or b, 但我觉得a,b都不顺。答案为A。请指点一下extending在这里的用法， 谢谢！
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发表于 2003-5-23 15:50:00
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