Only in recent years have tools been available for investigating nuclei in any detail.
举一反三
- In recent years, there have been over 30 foreign companies_________business in this city.
- How many methods of foreign currency translation have been used in recent years? (U.S. GAAP.)
- ______ there ______ any new developments in the past 20 years? A: Have… been B: Will…be C: Had…been D: Would… be
- Over the years, tools and technology themselves as a source of fundamental innovation have largely been ignored by historians and philosophers of science
- In recent years a number of ________ satellites have been put into orbit. A: communication B: transportation C: transportations D: communications