The defense works ______ built long ago to keep the enemy away.
A: were
B: has been
C: had been
D: was
A: were
B: has been
C: had been
D: was
举一反三
- The defense works ______ long ago to keep the enemy away. A: were built B: has been built C: had been built D: was built
- The defence works ____built long ago to keep the enemy away.
- Many factories________in the past three years. A: were built B: had built C: had been built D: have been built
- He………ill for a long time. A: has had B: has been C: is D: were
- All of those houses _______ in the past ten years． A: were built B: had been built C: have been built D: have built