—They are quiet aren't they?—Yes.They are accustomed at meals.A. to talkB. to not talkC.

问题补充：

—They are quiet，aren 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：词组“be accused to (习惯于)”，其中“to”是介词，后跟名词或动名词。动名词的否定式在其前加“not”。

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