问题补充:
Johnhadn’tbeenabletoquitsmokingatonce;hehadtocontrolhissmokingdesire.A.more or lessB.by and byC.little by littleD.now and then
答案:
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。