💡 Detailed Explanation
Translation: I have climbed Mount Fuji before.
- Grammatical point: Past experience pattern '〜たことがあります' (have done ~ before).
- Explanation: Experiencing something in the past is expressed as 'Verb (Ta-form) + ことがあります'. The verb is 登る (のぼる - to climb), and its Ta-form (past tense) is 'のぼった' (nobotta).
- Other choices are incorrect verb forms for this pattern.