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【单选题】
如果抛物线y=-x 2 +2（m-1）x+m+1与x轴交于A、B两点，且A点在x轴正半轴上，B点在x轴的负半轴上，则m的取值范围应是 [ ]A.
m>1
B.
m>-1
C.
m
D.
m<1< /div>
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