John hadn’t been able to stop smoking suddenly;he had to control his smoking desire .A. by

问题补充：

John hadn’t been able to stop smoking suddenly;he had to control his smoking desire .

A. by and by

B. sooner or later

C. little by little

D. from time to time

答案：

A. by and by

B. sooner or later

(答案→)C. little by little

D. from time to time

解析：by and by 不久以后，不一会儿；sooner or later 迟早；little by little相当于step by step 渐渐地；from time to time 时常地。句意为：约翰不能立即把烟戒掉，他得慢慢地控制烟瘾。