There is no ______ swimming-pool in this school and the students often go to swim ______.A.indoors; outdoorsB.indoor; outdoorC.indoor; outdoorsD.indoor; indoors
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C解析词性辨别。Indoors adv室内地；在室内。Indoor adj室内的。第一空用indoor做定语修饰swimming-poor.第二空用副词indoors做状语修饰go to swim.故C正确。