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【单选题】
若有以下函数定义,则执行函数 func(9) 调用后,其返回值是 ( ) 。 int func(int x) { int p; if(x==0||x==1) return 1; p=x-func(x-2); return p; }
A.
1
B.
5
C.
9
D.
7
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