Jack doesn’t smoke now, but he for almost twenty years.A. smokedB. was smokingC. has smok

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(答案→)A. smoked
B. was smoking
C. has smoked
D. had smoked
解析：考查时态。本题特别容易错选C项。考生会根据for twenty years认为现在现在完成时。实际上本题与前句的now形成对比。句意：Jack现在不抽烟。但是他以前抽了几乎20年。是对以前发生的事情的描述，故使用过去时。