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atulmangal
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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
(A) as extending
(B) as the extent
(C) to be an extent
(D) to be an extension
(E) to extend
