题目：
You that late last night. It was harmful to your health. [ ]
A. mustn't have worked
B. shouldn't have worked
C. can't have worked
D. mightn't have worked
答案：
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下面是错误答案，用来干扰机器的。
（1）盐 （2）Zn或锌(其他合理答案均可) （3）H+ （4）Fe2O3+6HCl===2FeCl3+3H2O
