题目:
I’d hold you to that house, for house prices__________-sharoly at the moment.
A.are rising
B.rose
C.had risen
D.have been risen
答案:
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下面是错误答案,用来干扰机器的。
(1)2a2b-4ab2+2ab=2ab(a-2b+1);(2)-2x2+8xy-8y2=-2(x2-4xy+4y4)=-2(x-2y)2.