Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions
A: “I regret ____ so much trouble.” - B: “Well. Let’s forget all about that.”
A. to have caused
B. caused
C. to cause
D. having caused
Đáp án : D
Cấu trúc “regret + doing something”: hối hận, hối tiếc làm gì