-They are quiet aren’t they?---yes. They are accustomed at meals.A. to talkingB. to no

问题补充：

---They are quiet, aren’t they?

---yes. They are accustomed at meals.

A. to talking

B. to not talking

C. to not talk

D. to talk

答案：

A. to talking

(答案→)B. to not talking

C. to not talk

D. to talk

解析：考查固定句式和动名词的否定式；固定句式:be accustomed to doing sth习惯做某事；本句中的to是介词，后面要接动名词的形式，动名词的否定式就是在动名词前面直接加not。句意：—他们很安静，不是吗？—是的。他们已解决习惯了吃饭时不要说话。故B正确。