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

问题补充：

Jack doesn’t smoke now, but he for almost twenty years.

A. smoked

B. was smoking

C. has smoked

D. had smoked

答案：

(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。是对以前发生的事情的描述，故使用过去时。