题目

We will fly a kite if your homework _______ before 3 o’clock.A．finishesB．will be finishedC．has finishedD．is finished 答案：D解析:略下列电离方程式书写正确的是（　　）A．CH3COONH4?CH3COO-+NH4+B．HI=H++I-C．H2S?2H++S2-D．NaHCO3=Na++H++CO32-