In the past ten years, some national parks _________ to protect the wildlife.
A: are set up
B: were set up
C: has been set up
D: have been set up
A: are set up
B: were set up
C: has been set up
D: have been set up
举一反三
- The theater______ by the time you return this time next year. A: will set up B: will have been set up C: will have set up D: will being set up
- Many a school in the United States（）to train men in theology. A: was set up B: were set up C: has set up D: have set up
- A modern city has been set up in _______ was a wasteland ten years ago.[1分]
- It was ________ was a waste land ten years ago ________ a modern city has been set up on．
- Of more money had been invested,we______a factory in Asia． A: will setup B: have set up C: would have set up D: had set up