已知下面代码最后的输出结果为【20 40】,那么横线处应该分别填写()
a =10 b =30 def test_1(): global① a = 10 b += a def test 2(): global ② a = 20 b = 10 test_1() test_2() print(a,b)
①b ②a
①a ②b
①a,b ②a
①b ②a,b