Mark the letter A, B, C, or D on your answer sheet to indicate the cor

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

Question 36. I've _______ some research to find out the cheapest way of travelling there.

• A. done
• B. made
• C. gone
• D. put

do/carry out research: tiến hành nghiên cứu