What great trouble the boy _____his father to give up smoking!A.had to persuadeB.had persuadedC.had persuadingD.had persuade
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C解析试题分析：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。考点：考查句型have trouble （in）doing sth中v-ing的用法。