6,7,9,15,( ),159,879
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[单选题]
6,7,9,15,( ),159,879
A . 21
B . 35
C . 67
D . 39
参考答案:
[单选题]
6,7,9,15,( ),159,879
A . 21
B . 35
C . 67
D . 39
参考答案: