元组变量t=("cat", "dog", "tiger", "human"),t[::–1]的结果是( )
(A){'human','tiger','dog','cat'}
(B)['human','tiger','dog','cat']
(C)运行出错
(D)('human','tiger','dog','cat')
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(A){'human','tiger','dog','cat'}
(B)['human','tiger','dog','cat']
(C)运行出错
(D)('human','tiger','dog','cat')