23、 ---Would you like to have a cigarette?

---No, thanks. It is three years since I _______.

A. have begun to smoke           B. smoked

C. began to not smoke             D. had smoked

23、B

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 ---Would you like to have a cigarette?

---No, thanks. It is three years since I _______.

A. have begun to smoke           B. smoked

C. began to not smoke             D. had smoked

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