问题
选择题
The GPS, originally _______ by the U.S. military, covers the whole world.
A. developing
B. to be developed
C. developed
D. having developed
答案
答案：C
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The GPS, originally _______ by the U.S. military, covers the whole world.
A. developing
B. to be developed
C. developed
D. having developed
答案：C