None

以下程序的运行结果为?( )

a = 10

if a > = 0:

    print(1)

if a >= 3:

    print(2)

if a >= 6:

    print(3)

if a >= 9:

    print(4)

A

1

B

1

2

C

1

2

3

D

1

2

3

4

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