---Takeacigarette,please.---No,thankyou.It'stwoyearssinceI________.A.

发布时间：2020-08-06 19:42:34

---Take a cigarette, please.---No,thank you. It's two years since I ________.A.didn't smokeB.had a smokeC.do not feel like smokingD.have smoked

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B解析导解：it be+time+since从句结构中，从句不用否定式，延续性动词用瞬间时态表示“有多长时间没有做某事”．
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