单项选择题
要声明一个长度为256个字符的定长字符串变量str，下列语句正确的是（）
A.dim str as string
B.dim str as string（256）
C.dim str as string[256]
D.dim str as string*256
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单项选择题
A.dim str as string
B.dim str as string（256）
C.dim str as string[256]
D.dim str as string*256
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