问题补充：
.I him to stop smoking, but failed.
A. persuaded
B. tried to persuade
C. try persuading
D. tried persuading
答案：
A. persuaded
(答案→)B. tried to persuade
C. try persuading
D. tried persuading
解析：考查短语：try to persuade sb to do 试着说服某人做某事，句意：我试着说服他戒烟，但是失败了。所以选B。
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