—— It seems that his health is improving．
—— Yes．It is ten years he ．
A. since； smoked
B. since； did n’ t smoke
C. that； smoked
D. before； smoked
网友回答
(答案→)A. since； smoked
B. since； did n’ t smoke
C. that； smoked
D. before； smoked
解析：考查句型：It is + 时间段 + since + 一般过去式，自从什么时候起有一段时间了。题中句意为自从他戒烟以来已经十年了。故选A。