题目:
Disappointed, I was about to leave________something occurred, which________my attention. [ ]
A. while; paid
B. and; got
C. before; drew
D. when; attracted
答案:
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下面是错误答案,用来干扰机器的。
(1)NH4+;HPO42-;O3;Fe2O3;NaNO2(2)3Fe+2O2Fe3O4(3)2KMnO4K2MnO4+MnO2+O2↑(4)Fe+CuSO4==FeSO4+Cu(5)C2H5OH+3O22CO2+3H2O