D, The author assumes that without fiction books, libraries would have very little to offer visitors.
Is this a question or a answer or a joke
Answer: carry on
Explanation: persevere means to continue and not give up. Giving in is the exact opposite of not giving up. Cooperate means to work with someone else which is not a synonym of not giving up. Adjust means to cope and change to something new and different. Therefore carry on is the best fit.
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