Question

Complete this sentence with passive or active verbs as necessary. Writing is a very early human achievement. As far as we know, the earliest writing systems (develop) approximately 6000 years ago.

Answer 1

Answer:

Writing is a very early human achievement. As far as we know, the earliest writing systems was developed (passive form of verb) approximately 6000 years ago.

Answer 2

Answer:

developed

Explanation:

Writing is a very early human achievement. As far as we know, the earliest writing systems developed approximately 6000 years ago.

past tense of develop is developed.