9,17,13,15,14,()
A.13
B.14
C.13.5
D.14.5
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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
9,17,13,15,14,() A.13 B.14 C.13.5 D.14.5
9,17,13,15,14,()A.13B.14C.13.5 D.14.5
9,17,13,15,14, ()。A. 13B. 14C. 13.5D. 14.5