99. China is the biggest country while the U.S.A is the biggest country.A. developed; d

问题补充：

99. China is the biggest country, while the U.S.A is the biggest country.

A. developed; developed

B. developing; developed

C. developing; developing

D. developed; developing

答案：

A. developed; developed

(答案→)B. developing; developed

C. developing; developing

D. developed; developing

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