--- 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

--- 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

--- 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

--- 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

---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

---They are quiet, aren’t they?

--Yes. They are accustomed ______ at meals.

-- 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 

--- 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