I think this belongs more in World Languages section but I know Spanish so this should be a piece of cake. Now the preterit tense is<span> (</span>el pretérito) in Spanish-it is the past tense examples are: -ar -er and -ir always keep these in mind. The correct<span> preterite ending is depending on who the subject of the action is. </span>These are the options presented in your question:
Bebimos= past tense (we drank) imos is the verb. Bebemos= present tense (we drink) Bebi= past tense (I drank) i in bebi is the verb.
Bebemos is the present tense so it can't be. Understand "el pretérito" now?
The adjective clause in this sentence is 'who has read thousands of books'. It is an appositive, separated from the rest of the text by commas, and has an adjectival meaning - it modifies the noun, Anthony.