In recent years a number of ________ satellites have been put into orbit.
A: communication
B: transportation
C: transportations
D: communications
A: communication
B: transportation
C: transportations
D: communications
举一反三
- A number of their products ________ put on exhibition. A: has been B: is C: have been D: are
- In recent years, there have been over 30 foreign companies_________business in this city.
- In recent years much more emphasis has been put ＿ developing the students’ productive skills.
- Only in recent years have tools been available for investigating nuclei in any detail.
- In recent years, there has been a marked increase in the number of technical terms in the terminology of ______. A: farming B: sports C: government D: fishery