问题
选择题
Mr. Keller ______ forty cigarettes a day until he gave it up.
A．had smoked
B．smokes
C．have smoked
D．smoked
答案
答案：D
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Mr. Keller ______ forty cigarettes a day until he gave it up.
A．had smoked
B．smokes
C．have smoked
D．smoked
答案：D
