Peter was to come to school this morning.A. a secondB. the secondC. a No. twoD. the two

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A. a second
(答案→)B. the second
C. a No. two
D. the two
解析：考查顺序表达。句意：今天早晨彼得是第二个到校。英语中顺序的表达方法是：冠词加序数词和No.加基数词，选项中只有B格式正确，故选B。