结构2:名词或代bai词(主格) + doing1)My mother cooking in the kitchen, I was doing my homework in my room. (表伴随du)我妈妈正在厨房做zhi饭,我在房间里dao做作业。
A,因为题目意思是说技术在快速进步,那是指现在还在进步,不是已经进步完了,所以选择A,用现在进行事态。