. John hadn’t been able to quit smoking at once; he had to control his smoking desire.A. m

问题补充：

. John hadn’t been able to quit smoking at once; he had to control his smoking desire.

A. more or less

B. by and by

C. little by little

D. now and then

答案：

A. more or less

B. by and by

(答案→)C. little by little

D. now and then

解析：

词组辨析;A. more or less或多或少B. by and by逐渐的C. little by little一点一点的D. now and then时而，句意是：约翰不能立刻戒烟，他不得不一点一点的控制抽烟的欲望。所以选C。