ed和ing的区别

问题描述:

ed和ing的区别
China will be ______coumtry in the middle of the next century.
A.high-developing
B.high-developed
C.highly-develop
D.highly-developed
请问一下不选A的原因,

ing是指发展中(国家)(譬如中国)
ed是指发达(国家)(譬如欧美国家)