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My aunt ____ letters to her son many years ago. But now she ____ emails to her son. ( )
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Henry broke the window .I’ll ask him why __________ .
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They arrived _____ Shanghai _______ a cold morning.
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向墙上按图钉时,很容易按进去,下列对图钉结构分析正确的是( )
1年前
已知二次函数f(x)=ax^2+bx(a,b为常数,且a不等于0),满足条件:f(2)=0,且方程f(x)=x有两个相等的实根(1)求f(x)的解析式
1年前