"The introduction to the book was excellent."
Translation:Η εισαγωγή του βιβλίου ήταν άριστη.
I don't remember learning the word "εξαιρετική" anywhere so far... ? It was in one of two correct answers in a multiple choice.
I've removed it from the "best" sentence and added it to one of the regular alternatives -- hopefully this should stop it from appearing in a mandatory multiple-choice question while still being accepted if someone knows the word and wishes to use it.