用所給詞的正確形式填空 In welcoming you to the university, I am ___________ of my own high school graduation. （）
用所給詞的正確形式填空 In welcoming you to the university, I am ___________ of my own high school graduation. （）
用所給詞的正確形式填空 In welcoming you to the university, I am ___________ of my own high school graduation. （）