若有以下定义,则数值为4的正确表达式是 。int a[10]={1,2,3,4,5,6,7,8,9,10};char c=’a’,d,g;A)a[g-c] B)a[4] C)a[’d’-’c’] D)a[‘d’-c]
·a[g-c]
·a[4]
·a[’d’-’c’]
·a[‘d’-c]

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