标题: 求解语法一道 [打印本页] 作者: gzguohongbo 时间: 2011-10-26 09:59 标题: 求解语法一道 1.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 (E) to extend 答案为A，我语感上选对了，但是说不清楚，这题是考as···as的对称吗