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
网友回答
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。