单句改错∶When he came in,the speaker found the listeners seating

问题描述:

单句改错∶When he came in,the speaker found the listeners seating

seating---->had been seated
进来时,演讲者发现听众已经坐好了.
be seated是做好的意思,而“听众坐好”是在过去某时已完成,故用过去完成时.