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答案是9
s = f(a)这里,a是3,f里面的a是1,所以f(a)返回4,f = 4;然后f里面的a自增,变成2
s = s + f(a),这里a还是3,但f里面的a是2,所以f(a)是5.s当前是4,s = s + f(a) = 4 + 5 = 9