9,17,13,15,14,______ ()
A.13
B.14
C.13.5
D.14.5
9,17,13,15,14,()A.13 B.14 C.13.5 D.14.5
3,3,4,5,7,7,11,9,______,______ () A.13,11 B.16,12 C.18,11 D.17,13
9,17,13,15,14,() A.13 B.14 C.13.5 D.14.5
9,17,13,15,14,()A.13B.14C.13.5D.14.5
9,17,13,15,14, ()。A. 13B. 14C. 13.5D. 14.5