[-A13] -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翻译并分析

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[-A13] -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翻译并分析
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[-A13] -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翻译并分析
[-A13] -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
翻译并分析

[-A13] -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翻译并分析
相信看了楼上几位的解释,你已经知道了：be accustomed to doing sth.习惯做某事（请注意：to 为介词,并非不定式的标志,即后面加动词原形）,所以排除A、B.
从句意看：—他们很安静,不是么?—是的,他们习惯了吃饭时不说话.很明显答句要选择否定意思的,只有选择D.
关键是D为什么对?be accustomed to doing sth.中doing 英语语法中称为动名词（属非谓语动词,此为牛津版英语模块五语法内容）.动名词一般式的否定式是将直接否定词not置于动名词之前.He said he so much regretted not being able to swim.他说他对不会游泳感到非常遗憾.
再举一个不定式的例子：Tell him ___ the window.
A.to shut not　 B.not to shut　C.to not shut 选哪一个?因为知道tell sb.to do sth.和tell sb.not to do sth.你可以马上选中B.在这两个搭配中,to do 就是不定式.不定式的否定直接加在to之前（不需要背语法解释,只要把固定搭配记清,语法不攻自破~）
所以,总结一下：动名词的否定式加在doing前,而不定式的否定式直接加在to前.
我的讲解有点啰嗦了,不知你懂了没?

----他们很安静，不是么？（这是一个反义疑问句）
-----是的，（他们很安静），他们习惯了吃饭时不说话。
accustome sb to doing sth ，变被动后，转换为--sb be accustomed to doing sth 。
然后，not应位于介词to 之后。。
希望我的回答能让您满意，谢谢采...

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----他们很安静，不是么？（这是一个反义疑问句）
-----是的，（他们很安静），他们习惯了吃饭时不说话。
accustome sb to doing sth ，变被动后，转换为--sb be accustomed to doing sth 。
然后，not应位于介词to 之后。。
希望我的回答能让您满意，谢谢采纳。

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