23. He ... all the documents for his report.

The sentence implies that the action of preparing the documents is completed and relevant to the present or a past context. 'Has prepared' (present perfect) is a common choice for completed actions with present relevance. However, without further context, 'had prepared' (past perfect) would also be plausible if referring to a past event. Given the options, 'has prepared' is the most likely intended answer for a general exercise.