The two naughty boys were quiet when eating, and they were accustomed to at meals.
A. talk
B. talking
C. not to talk
D. not talking
网友回答
A. talk
B. talking
C. not to talk
(答案→)D. not talking
解析：句意:两个淘气的孩子吃饭的时候很安静，他们习惯于吃饭的时候不说话。这里be accustomed to doing，其否定形式是be accustomed not to doing，根据句意故选D。