--- ________ have you been skating?--- I've been skating for five hours.A.How oftenB.How soonC.How longD.How old
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C解析思维分析：How often...？是频度副词，指多久一次，多长时间一次的意思；How soon...？指多久，常对in的短语提问；How old...?指多大，常提问年龄；How long...?指多长时间，常对段时间提问，此句由答语five hours为段时间，可知选C。