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Visual Basic语言程序设计单选题中等

以下哪项代码能够正确地将两个字符串合并，并在中间添加一个空格？

As = "abc" + "def" + " "

Bs = "abc" & " " & "def"

Cs = "abc" + "def"

Ds = "abc" & "def" & " "

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