Many factories________in the past three years.
A: were built
B: had built
C: had been built
D: have been built
A: were built
B: had built
C: had been built
D: have been built
举一反三
- All of those houses _______ in the past ten years． A: were built B: had been built C: have been built D: have built
- It is reported that a new railway ________ there by the end of next year. A: will be built B: will have been built C: was built D: had been built
- A lot of tall buildings _______in his hometown in the last three years. A: have built up B: built up C: were built up D: have been built up
- The defense works ______ long ago to keep the enemy away. A: were built B: has been built C: had been built D: was built
- A lot of tall buildings ______ in our city last year. A: was built B: were built C: had been built