7, 9, 1, 15, -5, 21, ()。 A.36
B.-11
C.13
D.27
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1,3,3,5,7,9,13,15(),() A:19,21;B:19,23;C:21
7, 9, 1, 15, -5, 21, ()。 A.36 B.-11 C.13 D.27
7,9, 1,15,-5,21,()。 A.36B.-11C.13D.27
7,9,1,15,-5,21,()A. 36 B.-11 C.13 D.27
7,9,1,15,-5,21,()。A.36B.-11 C.13D.27
7,9,1,15,-5,21,()。A.36 B.-11 C.13 D.27