Tony is a quiet boy and he is accustomed at meals, which is always appreciated.A. not to

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A. not to talk
B. to not talk
(答案→)C. to not talking
D. not to talking
解析：固定搭配be/get accustomed to sth/doing sth习惯于某事/做某事；其中的to是介词，后面要接名词或者动名词形式。动名词的否定式是在前面直接加not。句义：Tony是一个安静的男孩，他习惯于吃饭时不说话，这一点总是收到人们的欣赏。故C正确。