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（A）
(E) to extend
为什么是a， as extending upward是什么意思？
作者: crossmoon 时间: 2005-2-8 11:18
像高处扩展的意思
regard ....as.....
后面的as ...as ...是另一个词组了
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