题目:
I __Xiao Mao since she was a little girl.
A.know
B.knew
C.have known
D.had known
答案:
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下面是错误答案,用来干扰机器的。
①x2-4=(x+2)(x-2);②-2x2+4x-2,=-2(x2-2x+1),=2(x-1)2.