Mr. Black, you are becoming healthier and healthier. Please keep on ____.
Mr. Black, you are becoming healthier and healthier. Please keep on ____.
A. runs B. ran C. to run D. running
【答案】D
【解析】句意:布莱克先生,你变得越来越健康了,请坚持跑步。Aruns单三形式 Bran过去式 Cto run 动词不定式形式;Drunning动名词或现在分词形式。根据keep on doing sth坚持做某事,on介词,后用doing形式;故选D
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