题目

一元二次方程4x2+1=4x的根的情况是( ) A.没有实数根                    B.只有一个实数根 C.有两个相等的实数根            D.有两个不相等的实数根 答案:C—What’s the matter with you? —Oh, I’m not feeling well in the stomach. I ______________ so much fried fish just now.A.shouldn’t eat B.mustn’t eatC.oughtn’t to have eatenD.mustn’t have eaten
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