Answer:
I was asked to keep a record of all the attendees of the seminar by the organizing committee.
Explanation:
Phrases are words, short groups of words that are used to refer to something else. They cannot be taken in the literal sense and maybe a means to refer to something else.
The phrase "keep a record" means to keep certain information safe.
So, making a sentence using the phrase "keep a record" is-
I was asked to keep a record of all the attendees of the seminar by the organizing committee.
