—It seems that his health is improving.—Yes. It is ten years ___ he _____.A.that, smokedB.after, didn’t smokeC.since, smokedD.before, smoked
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C解析在It’s--------since-----句中,若动词为延续性动词,则表示其动词的反义概念。It’s 10 years since he smoked.表示他已戒烟十年了。等于It’s 10 years since he gave up smoking. 故选C。