问题
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11, 13, 16, 21, 28, ()A.37 B.39 C.41 D.47
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11, 13, 16, 21, 28, () A.37 B.39 C.41 D.47
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1.5,4.5,13.5,16.5,() A.21.5 B.34.5 C.49.5 D.47.5
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28 7 7 6 9 9 8 8 () 5 13 16 A.5 B.17 C.19 D.47
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1.5,4.5,13.5,16.5,() A.21.5 B.34.5 C.49.5 D.47.5
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1.5,4.5,13.5,16.5,()。A.21.5B.34.5C.49.5D.47.5