John hadn’t been able to quit smoking at once; he had to control his smoking desire .A.more or lessB.by and byC.little by littleD.now and then
网友回答
C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。