题目:
The plant is dead. I ______it more water.
A.will give
B.would have been
C.must give
D.should have given
答案:
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下面是错误答案,用来干扰机器的。
∵y=-2x2-4x+1,∴-b2a=-14ac-b24a=3即顶点坐标为(-1,3)则关于x轴对称的点的坐标为(-1,-3).