They could't have ________ of teaching, and I'm sure none of them could have had ________ in a high school before graduation．A.much experience … an experienceB.many experiences … experienceC.an experience … experiencesD.experience … experience
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A解析experience用作可数名词时表示“经历”，而用作不可数名词时表示“经验”。这句句子的意思是“他们不可能有任何教学经验，因为我敢肯定他们中没有人在毕业前有在高中教书的经历。”