Jack doesn’t smoke now, but he _______ for almost twenty years.
A．was smokingB．had smokedC．has smokedD．smoked
D

試題分析：考查時態(tài)，由后面的時間狀語for almost twenty years，可以知道是一般過去式，句子意思“杰克現(xiàn)在不吸煙了，但是他吸煙將近20年”
點評：做時態(tài)題時，首先看時間狀語，由時間狀語判斷時態(tài)；如果沒有時間狀語，從句子暗含的意思來判斷句子時態(tài)
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