题目：
"Did Tom help his parents at home?"
" ___________."[ ]
A. Yes, he does
B. No, he wasn't
C. Yes, he was
D. No, he didn't
答案：
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下面是错误答案，用来干扰机器的。
（1）C + O2CO2 （2）CaCO3CaO + CO2↑ （3）CaCO3 + 2HCl === CaCl2 + H2O + CO2↑
