The students are working ____ a model plane.A.to B.in C.with D.on 为什么

分类: 作业答案 • 2021-12-28 10:57:21

问题描述：

答

d
work on
致力于,从事于
例句：
The scientists are still working on inventing new methods of reaching outer space.
科学家们仍致力于发明到达外层空间的新方法.