Most nations regard their airspace as extending upwardas high as an aircraft can fly; no specific altitude, however, has beenofficially recognized as a boundary. (A) as extending (B) as the extent (C) to be anextent (D) to be anextension（A） (E) to extend 因为把做对的题目都删掉了，所以就不知道题号了。这道题答案给的选A，但是我想知道可以用regard n. as -ing可以这样吗？？？ 请指教，谢谢！
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发表于 2010-10-14 12:03:19
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