Luckily, they did not used the machinery.
Luckily, they did not used the machinery.
Luckily, they have not used the machinery.
Luckily, they have not used the machinery.
Luckily, I did not used the machinery.
Luckily, I did not used the machinery.
Luckily, they had not used the machinery.
Luckily, they had not used the machinery.
Correct Answer:
Luckily, they did not used the machinery.
Luckily, they did not used the machinery.