问题
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1,5,9,14,21,() A. 30;B. 32;C. 34;D. 36;
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0,1/3, 5/8,5/6,9/10,()A.5/6 B.8/9 C.13/14 D.21/20
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0,1/3,5/8,5/6,9/10,()A.5/6 B.8/9 C.13/14 D.21/20
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0,1/3,5/8,5/6,9/10,()A.5/6B.8/9C.13/14D.21/20
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5 8 -4 9 () 30 18 21A.14 B.17 C.20 D.26
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0,1/3,5/8,5/6,9/10,() A.5/6 B.8/9 C.13/14 D.21/20