如下程序的输出结果是： a = 30 b = 1 if a >=10: a = 20 elif a>=20: a = 30 elif a>=30: b = a else: b = 0 print("a={

题目：如下程序的输出结果是： a = 30 b = 1 if a >=10: a = 20 elif a>=20: a = 30 elif a>=30: b = a else: b = 0 print("a={}, b={}".format(a,b))

A. a=30, b=1

B. a=30, b=30

C. a=20, b=20

D. a=20, b=1

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