31. The decision Internet addiction（成瘾）as a mental disorder has caused much debate.A. to

问题补充：

31. The decision Internet addiction（成瘾）as a mental disorder has caused much debate.

A. to classify

B. classifying

C. being classified

D. to be classified

答案：

(答案→)A. to classify

B. classifying

C. being classified

D. to be classified

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