Question 1: It was his own fault, but I couldn’t help ________ sorry f

Question 1: It was his own fault, but I couldn’t help ________ sorry for him.

• A. feeling
• B. to feel
• C. having felt
• D. to have felt

- Căn cứ vào cụm từ: “can’t help + Ving” : không thể không làm gì

- Khi ngữ cảnh ở quá khứ: couldn’t help + Ving: đã không thể không làm gì