—Have a cigarette will you ? —No thanks. I heavily but I’ve given it up recently. A. a

问题补充：

—Have a cigarette, will you ?

—No, thanks. I heavily, but I’ve given it up recently.

A. am used to smoking

B. used to smoking

C. used to smoke

D. has used to smoke

答案：

A. am used to smoking

B. used to smoking

(答案→)C. used to smoke

D. has used to smoke

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