问题补充:
What great trouble the boy his father to give up smoking!
A. had to persuade
B. had persuaded
C. had persuading
D. had persuade
答案:
A. had to persuade
B. had persuaded
(答案→)C. had persuading
D. had persuade
解析:考查固定句型。做此题时应注意将题干还原成陈述句结构:The boy had great trouble (in)persuading his father to give up smoking。have trouble/problems/a hard time (in) doing sth表示做某事非常费力,句中的in可以省略。句意:那男孩说服他父亲戒烟费了多大劲啊! 故C正确。