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【单选题】
已知f（x+1）=x 2 -x-2，则f（x）的解析式是（ ）A.
f（x）=x 2 +x-3
B.
f（x）=x 2 +x+1
C.
f（x）=x 2 -3x
D.
f（x）=x 2 -3x-2
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