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【单选题】
设A
n
为等差数列,且公差D≠0,前n项和s
n
=mn
2
+pn+t,则m,p,t满足( )
A.m≠0,t=0
B.m=t=0
C.m≠0,p≠0,t≠0
D.m=0,t≠0
E.(E) 以上都不对
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