问题
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:2/3,1/2,2/5,1/3,2/7,()。 A.1/4 B.1/6 C.2/11 D.2/9
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2/3,1/2,2/5,1/3,2/7,()。A.1/4 B.1/6 C.2/11 D.2/9
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.2/3,1/2,2/5,1/3,2/7,() A.1/4 B.1/6 C.2/11 D.2/9
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2/3,1/2,2/5,1/3,2/7,() A.1/4 B.1/6 C.2/11 D.2/9
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2/3, 1/2, 2/5, 1/3, 9/7,().A.1/4 B.1/6C.2/11 D.2/9
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2/3, 1/2, 2/5, 1/3, 9/7,().A.1/4 B.1/6C.2/11 D.2/9