．Play often seen as activity for kids is still important indevelopment of teenagers.A. t

问题补充：

．Play, often seen as activity for kids, is still important indevelopment of teenagers.

A. the; the

B. an; the

C. an; 不填

D. the; 不填

答案：

A. the; the

(答案→)B. an; the

C. an; 不填

D. the; 不填

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