单选题Jim is eight-year-old boy

问题补充：

单选题Jimiseight-year-oldboy.Hespendshalf_____hourplaying_____pianoeveryday.A.a; an; aB.an; the; anC.an; an; theD.the; a; /

答案：

C解析考查冠词。半个小时half an hour, 而乐器前加定冠词the。故选C。