问题补充：
-- They are quiet, aren’t they? --- Yes. They are accustomed at meals.
A. to talk
B. to not talk
C. to talking
D. to not talking
答案：
A. to talk
B. to not talk
C. to talking
(答案→)D. to not talking
解析：考查情景交际和固定搭配。“他们很安静，不是吗？”“是的。他们习惯了在吃饭时保持安静。”be accustomed to doing sth.“习惯于做某事”，排除A、B；C“习惯于说话”，与句意不符。动名词的否定是在动名词前加not。故选D。
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