单项选择题
A.thB.theC.tohD.that
A.0B.1C.nullD.undefined
A.["2019","0`","01"]B.["2019-","01-"]C.["9-","1-"]D.["9-","1-","01"]
A.["2018","2","14"]B.["2018-","2-"]C.["8-","2-"]D.["2018-","2-","14"]
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