问题
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13,14,16,21,(),76A.23 B.35 C.27 D.22
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1/3,4/7 ,7/11 ,2/3 ,13/19 ,()A. 16/21 B. 16/23 C. 18/21 D. 17/21
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23,12,25,13,27,()A.14 B.16 C.211 D.29
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1/3,4/7 ,7/11 ,2/3 ,13/19 ,() A. 16/21 B. 16/23 C. 18/21 D. 17/21
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13,14,16,21,(),76A.23B.35 C.27 D.22
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13, 14, 16, 21, (), 76A.23 B.35 C.27 D.22