The principles they developed are still used in aircraft design today.
A
The principles they developed are still used in aircraft design today.
B
The principles that were developed by them are still used in aircraft design today.
C
They developed principles that are still used in aircraft design today.
D
The principles they developed are still being used in aircraft design today.
1 answer
The best way to revise sentence 11, while maintaining clarity and conciseness, is option C:
C
They developed principles that are still used in aircraft design today.
This revision is more direct and removes the passive voice, making the sentence clearer and more engaging.
