执行结果为[1, 2, 3, 1, 2, 3, 1, 2, 3] 的表达式是______。( ).
(A)[1,2,3]+ [1,2,3]
(B)['1','2','3']+ ['1','2','3']+ ['1','2','3']
(C)[1, 2, 3]**3
(D)[1, 2, 3]*3
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(A)[1,2,3]+ [1,2,3]
(B)['1','2','3']+ ['1','2','3']+ ['1','2','3']
(C)[1, 2, 3]**3
(D)[1, 2, 3]*3