The small boys decided to each other.A. not talkB. not talkingC. not to talkD. talk

问题补充：

The small boys decided to each other.

A. not talk

B. not talking

C. not to talk

D. talk

答案：

A. not talk

B. not talking

(答案→)C. not to talk

D. talk

解析：decide“决定”的用法是decide to do或decide not to do。 each other相互；根据题干，本句的意思是“这些小孩们决定不相互说话了。”根据结构，本题应该选C。