—It seems that his health is improving.—Yes. It is ten years he .A. that smokedB. after

问题补充：

—It seems that his health is improving.

—Yes. It is ten years he .

A. that, smoked

B. after, didn’t smoke

C. since, smoked

D. before, smoked

答案：

A. that, smoked

B. after, didn’t smoke

C. since, smoked

D. before, smoked

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。