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Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
- "You three boys look very guilty."
- "What____________since I left the room?"
A. did you do
B. have you done
C. had you done
D. do you do
- "You three boys look very guilty."
- "What____________since I left the room?"
A. did you do
B. have you done
C. had you done
D. do you do
What have you done SINCE I left the room?
Thì hiện tại hoàn thành thì quá khứ đơn
Thì hiện tại hoàn thành thì quá khứ đơn
Đáp án B.