现在进行时疑问句与否定句 — 英语选择题

晚饭后，Liu Tao 看到妈妈在厨房里。他想问：妈妈在洗碗吗？他想说：爸爸没有在扫地。下面哪一组句子是正确的？ A. Is Mum washing the dishes? Dad isn't sweeping the floor. B. Does Mum washing the dishes? Dad not sweeping the floor. C. Is Mum wash the dishes? Dad doesn't sweeping the floor. D. Are Mum washing the dishes? Dad isn't sweep the floor.