to have & having

… is definitely one of the worst oversea disasters to have involved residents of the SAR.… is definitely one of the worst oversea disasters having involved residents of the SAR. 用to infinite的話是看成是adjective phrase形容片語作為補充前述的主題。用present participle的話是看成是noun phrase名詞片語作為定義前述的主題一種必要條件/處境狀態。 雖然to have involved跟having involved本身意義上分別不大，但要考慮的是所說的residents of the SAR這內容對於前述的disaster是主要/必然的關係還是附加的形容關係。 從全句的表達和實際內容而言，指出有SAR的居民受害是那disaster當中的一點有關的資料，而不是全部或跟那disaster的定義條件/全部。所以寫作to have involved是較為合情理。 如果後面的內容是對那disaster關鍵的解釋或因由的定義性條件，則用having involved會正確代表寫作的用意：… is definitely one of the worst oversea disaster having involved victims from 5 different countries.