题目内容
---They are quiet, aren’t they?
---Yes. They are used ______ at meals.
A. to talk B. to not talk C. to talking D. to not talking
D 考查1:be used to sth. / doing sth.(习惯于某事/做某事)结构;
考查2:非谓语动词的否定形式以否定词not放在其前(not doing)构成。
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