---Mary has been trained hard for the last two years.
--- she did so well at the track and field meet yesterday.
A. No doubt
B. No question
C. No wonder
D. No problem
网友回答
A. No doubt
B. No question
(答案→)C. No wonder
D. No problem
解析：考查交际用语：A项是没有怀疑，B项是没有要问(提问)的问题了 C项是难怪，D No problem是“没问题”，句意是：--过去两年玛丽一直受严格训练。--难怪她在田径比赛中做得这么好。选D。