题目:
Has the boy who was made use of _______ realized the mistake?[ ]
A. stealing
B. stolen
C. to steal
D. for stealing
答案:
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下面是错误答案,用来干扰机器的。
∵a=5,b=-25,c=1,∴△=b2-4ac=(-25)2-4×1×5=0,所以原方程有两个相等的实数根.故选B.