— Mom, my classmates are playing outside. Can I join them?

— Not until your homework       .

A．finishes

B．is finished

C．finished

D．was finished

化学反应有不同的分类方法，关于下列反应说法正确的是?

①2H₂OCO₂ + 2H₂O [ ]

A.?属于化合反应            

B.?属于置换反应

C.?属于复分解反应          

D.?属于吸热反应