问题
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2/3,1/2,3/7,7/18,() A.5/9;B.4/11;C.3/13;D.2/5
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:-1,0,-3,-2,-5,-4,()。A.-7 B.-9 C.-11 D.-13
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:1,2/3,5/9,1/2,7/15,4/9,()。A.5/9 B.3/5 C.2/13D.3/7
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-1,0,-3,-2,-5,-4,()。A.-7 B.-9 C.-11 D.-13
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2/3, 1/2, 3/7, 7/18,() A.5/9 B.3/13 C.4/11 D. 2/5
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1,2/3,5/9,1/2,7/15,4/9,()。 A.5/9B.3/5C.2/13 D.3/7