—Those scientists invented a robot to care for kids!
—It’s not surprising.They ____ wonders all the time.
A.worked | B.were working | C.work | D.have been working |
相关知识点
推荐套卷
—Those scientists invented a robot to care for kids!
—It’s not surprising.They ____ wonders all the time.
A.worked | B.were working | C.work | D.have been working |