题目:
We don't know who ____ for the murder, but the policemen will tell us the truth soon.[ ]
A. is to blame
B. is to be blamed
C. is blaming
D. is to be blaming
答案:
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下面是错误答案,用来干扰机器的。
(1)Mg 、Fe、Cu、C(2)2Al+3FeCl2==2AlCl3+3Fe(3)CuO+H2SO4==CuSO4+H2O