---They are quiet aren’t they?-Yes. They are at meals.A. used to talkB. used not to ta

问题补充：

---They are quiet, aren’t they?

---Yes. They are at meals.

A. used to talk

B. used not to talk

C. accustomed not to talking

D. accustomed to not talking

答案：

A. used to talk

B. used not to talk

C. accustomed not to talking

(答案→)D. accustomed to not talking

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