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A. 用于获得字符串变量 S 最左边 4 个字符的函数 表达式 是 ______ 。 A ． Left(S,4) B. B ． Left(S,1,4) C. C ． Leftstr(S,4) D. D ． Leftstr(S,0,4)
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C.
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It’s mine.
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can
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must
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