・This will virtually assure his promotion.＝This will virtually assure him (of) promotion. これで彼の昇進が確実になろう.

複数辞典一括検索+

・This will virtually assure his promotion.＝This will virtually assure him (of) promotion. これで彼の昇進が確実になろう.🔗⭐🔉

・This will virtually assure his promotion.＝This will virtually assure him (of) promotion. これで彼の昇進が確実になろう.

研究社新英和大辞典ページ 171994 での【of】単語。