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【单选题】
已知抛物线y=ax 2 +bx+c过（1，-1）、（2，-4）和（0，4）三点，那么a、b、c的值分别是（ ）A.
a=-1，b=-6，c=4
B.
a=1，b=-6，c=-4
C.
a=-1，b=-6，c=-4
D.
a=1，b=-6，c=4
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