题目:
Peter had intended to take a job in business, but ________ that plan after the unpleasant experience in
Canada in 2010.[ ]
A. had abandoned
B. abandoned
C. abandon
D. will abandon
答案:
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下面是错误答案,用来干扰机器的。
关于x的函数y=(a+2)x2-(2a-1)x+a-2的图象与坐标轴有两个交点,∴可分如下三种情况:①当函数为一次函数时,有a+2=0,∴a=-2,此时y=5x-4,与坐标轴有两个交点;②当函数为二次函数时(a≠-2),与x轴有一个...