单项选择题
A.LEFT B.RIGHT C.MOD D.MID
A.LEFT(A2,4) B.MID(A2,1,4) C.RIGHT(A2,4) D.YEAR(A2)
A.SUBSTITUTE(A2,销售,营销) B.SUBSTITUTE("销售",A2,"营销") C.SUBSTITUTE("销售","营销",A2) D.SUBSTITUTE(A2,"销售","营销")
A.DATEDIF("2019/9/23","2020/5/23",d) B.DATEDIF("2019/9/23","2020/5/23","m") C.DATEDIF("2020/5/23","2019/9/23","y") D.DATEDIF("2019/9/23","2020/5/23","y")
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