Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
My teeth were a little yellow so I _____by the dentist
A. was cleaned
B. have them cleaned
C. had cleaned them
D. had them cleaned
Đáp án là D.
Have st done (by sb): có cái gì được làm bởi ai, ở đây phải chia quá khứ vì có “were” ở trước