___________ is the most difficult of ___________ .A.Lesson Nine … Book ThreeB.The lesson nine … the book threeC.The nine lesson … the three bookD.The Nineth Lesson … the Third Book
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A解析分析 编号的东西，可用基数词，也可用序数词，但用基数词时，均要大写字母开头；用序数词时，加定冠词the后均用小写字母开头。本题选择A正确。