问题
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12,10,14,13,16,16,(),()A.14,18B.20,19C.18,19D.15,18
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12,10,14,13,16,16,(),() A.14,18B.20,19C.18,19D.15,18
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4,5,7,9,13,15,()A.17 B.19 C.18 D.20
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12, 10, 14, 13, 16, 16,______,______ () A.14,18 B.20,19 C.18,19 D.15,18
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12, 10, 14, 13, 16, 16, (),() A.14, 18 B.20, 19 C.18, 19 D.15, 18
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2,3,5,7,11,13,(),19,… A.15 B.16 C.17 D.18