问题
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1,3,3,6,7,12,15,() A.17;B.27;C.30;D.24;
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1,3/4,9/5,7/16,25/9,()15/38 B.11/36 C.14/27 D.18/29
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1,3/4,9/5,7/16,25/9,______ () A.15/38 B.11/36 C.14/27 D.18/29
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1,3/4,9/5,7/16,25/9,() A.15/38 B.11/36 C.14/27 D.18/29
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1,3/4,9/5,7/16,25/9,()A.15/38B.11/36C.14/27D.18/29
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3,-1,6,7,27,(),171A.36 B.50 C.62 D.73