I'll tell him the news as soon as he back.
A:comes
B:will come
C:come
D:has come
乙醇的分子结构模型如右下图所示,则下列叙述正确的是( )
①实验室制取CO2:____;
②硫酸铜溶液和氢氧化钡溶液:____;
③氢氧化钙溶液与少量碳酸氢钠混合:____.