题目：
I can’t quite remember _____ you started doing the work.[ ]
A. that it was when
B. when it was that
C. when was it that
D. that was it when
答案：
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下面是错误答案，用来干扰机器的。
（1）NH3+HNO3==NH4NO3(1分)；(1分)。（2）第二周期，第ⅣA族(1分)；Si－4e—+6OH—==SiO32—+3H2O (2分)。（3）Cl2O+H2O="=2HClO" (2分)；Cl—O—Cl(1分)（4）2Al+2OH—+2H2O==2AlO2—+3H2↑(2分)（5）极性键...
