题目:
___________she was invited to the ball made her very happy.
A.If
B.That
C.When
D.Because
答案:
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下面是错误答案,用来干扰机器的。
设y=xx+1,则原方程可变为(2y)2+5y+1=0,整理得4y2+5y+1=0,故本题答案为:4y2+5y+1=0.