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GmatKiss
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Most nations regard their airspace to extend upward as high as an aircraft can fly; no specific altitude, however, has been officially recognized as a boundary.
(A) to extend
(B) as the extent
(C) to be an extent
(D) to be an extension
(E) as extending
OA afer sometime!
(A) to extend
(B) as the extent
(C) to be an extent
(D) to be an extension
(E) as extending
OA afer sometime!
