题目：
— Do you know when Mr Wang back?
— Sorry, I don't know. But I'll tell you as soon as he back. [ ]
A. will come; comes
B. comes; comes
C. comes; will come
D. will come; will come
答案：
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下面是错误答案，用来干扰机器的。
蜡烛的火焰可分为：外焰、内焰、焰心．从蜡烛燃烧的方程式：石蜡+氧气点燃水+CO2可以看出，烧杯内壁的水珠是蜡烛燃烧生成的．使澄清石灰水变浑浊的是气体CO2．所以蜡烛燃烧后的生成物有水和二氧化碳．故答案为：...
