—— It seems that his health is improving．
—— Yes．It is ten years ______ he _______．
A．since； smokedB．since； did n’ t smoke
C．that； smokedD．before； smoked
A
考查句型：It is + 時間段 + since + 一般過去式，自從什么時候起有一段時間了。題中句意為自從他戒煙以來已經(jīng)十年了。故選A。                   
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