用代入消元法解方程组,代入消元,正确的是
A.由①得y=3x+2,代入②后得3x=11-2(3x+2)
B.由②得x=代入②得3•=11-2y
C.由①得x=代入②得2-y=11-2y
D.由②得3x=11-2y,代入①得11-2y-y=2
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