Question

i gave to him ___ useful book(add determiner)

Answer 1

Answer:

I gave to him an useful book

Answer 2

Answer:

an

Explanation:

First of all, the sentence is wrong. ( " to " should not be there )

It should be: - I gave him ____ useful book.

The ans here should be "an" as : - " I gave him an useful book. "

HOPE THIS HELPS YOU :)