20. The manager was satisfied to see many new products ______ after great effort.
A: having developed
B: to develop
C: developed
D: develop
A: having developed
B: to develop
C: developed
D: develop
举一反三
- The happiness for the teacher is seeing children ______ so quickly. A: developed B: to be developed C: develop D: to develop
- Many Chinese brands, ______ their reputation over centuries, are facing new challenges in the 21st century. A: developed B: developing C: being developed D: having developed
- Without the Internet, the telecommunications industry _______ so fast in the last few decades. A: would not develop B: could not develop C: will not have developed D: would not have developed
- Why did many countries of the South send students to the developed countries A: Because these countries need trained personnel to develop their countries. B: Because the developed countries need more qualified professionals. C: Because these students can stay on in the developed countries after the training. D: Because these countries want to establish friendly relationship with the developed countries.
- It was _______ creative thinking that I took the course, not to get high marks in examinations. A: developing B: to develop C: developed D: to have developed