There has been developed a method for producing vastly more powerful rays.
举一反三
- ____________ for more than 20 years, Chinese tourism has become the dragon business of the third industry of our country. A: . Being developed B: . Having developed C: . Developing D: . Having been developed
- What does he say about how the situation has developed recently A: Demand for consultants has increased. B: There are more specialised services available. C: The cost of consultancy has been reduced.
- Recently more and more attention has been _.
- Albert Einstein (has been) the scientist who developed the theory of relativity.
- 中国大学MOOC: The company has been producing this model of machine tool ______ 2008.