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