下列反应属于取代反应的组合是
①CH3CH=CH2+Br2
CH3CHBrCH2Br
②CH3COOH+CH3CH2OH
CH3COOCH2CH3+H2O
③2CH3CH2OH+O2
2CH3CHO+2H2O
④
+Br2
+HBr．
| A．①② | B．③④ | C．①③ | D．②④ |
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