问题
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3,3,4,5,7,7,11,9,______,______ () A.13,11 B.16,12 C.18,11 D.17,13
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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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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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3,3,4,5,7,7,11,9,() A.13,11 B.16,12 C.18,11 D.17,13
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3,3,4,5,7,7,11,9,(),()A.13.11 B.16,12C.18,11D.17,13
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3,3,4,5,7,7,11,9,()A.13 B.16C.18D.17