函数 =concatenate("abc","abc","abc","abc")的运算结果是： A: 3 B: 4 C: abc D: abcabcabcabc
函数 =concatenate("abc","abc","abc","abc")的运算结果是： A: 3 B: 4 C: abc D: abcabcabcabc
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函数 =concatenate("abc","abc","abc","abc")的运算结果是： A: 3 B: 4 C: abc D: abcabcabcabc