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