Over the years, tools and technology themselves as a source of fundamental innovation have largely been ignored by historians and philosophers of science
举一反三
- Our incomes have been increasing over the years ______
- Only in recent years have tools been available for investigating nuclei in any detail.
- In recent years, there have been over 30 foreign companies_________business in this city.
- The committee (A. has been arguing B. have been arguing) over the problem among themselves for two hours. A: has been arguing B: have been arguing
- Over the past few years, Over the past few years,<br/>these companies have been able to maintain a steady (grow)<br/>______ <br/>in their business.