题目内容
—They are quiet, aren’t they?
—Yes, They are used ________ at meals.
A.to talkB.to talking
C.to not talkingD.not to talk
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题目内容
—They are quiet, aren’t they?
—Yes, They are used ________ at meals.
A.to talkB.to talking
C.to not talkingD.not to talk