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