单选题
执行以下代码后输出的结果是？（?）
d={1:'monkey',2:'panda',3:'bird',4:'fish'}d[5]='sheep'del d[3]d[3]='dog'print(d)A.
{1: 'monkey', 2: 'panda', 4: 'fish', 5: 'sheep', 3: 'cat'}
B.
{1: 'monkey', 2: 'panda', 4: 'fish', 5: 'sheep', 3: 'dog'}
C.
{1: 'monkey', 2: 'panda', 3: 'dog, 5: 'sheep', 4: 'duck'}
D.
{1: 'monkey', 2: 'panda', 3: 'cat', 5: 'sheep', 4: 'duck'}
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