單項選擇題

Given:

Which statement is true?()

A.The output could be 5-1 6-1 6-2 5-2
B.The output could be 6-1 6-2 5-1 5-2
C.The output could be 6-1 5-2 6-2 5-1
D.The output could be 6-1 6-2 5-1 7-1

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