若0<n 1 <n 2 <n 3 <1,且 a=lo g n 1 m , b=lo g n 2 m , c=lo g n 3 m ,则下列大小关系中①a>b>c②c>b>a③b>a>c④a=b=c,不可能的是( )
A.
③
B.
③④
C.
①②
D.
①④
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