问题描述：
有关英语语法的知识
China will be a _____ country by the middle of the next century.
A.hing-developing B.high-developed
C.highly-developed D.highly-develop
选哪个答案,请说明理由.
China will be a _____ country by the middle of the next century.
A.hing-developing B.high-developed
C.highly-developed D.highly-develop
选哪个答案,请说明理由.
问题解答：
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