Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions Câu 6: I finished my course. I came back to work in this company. A. I finished my course, I come back to work in this company B. I had finished my course, I had come back to work in this company C. I finished my course, I have come back to work in this company D. I had finished my course, I came back to work in this company Câu 7: I met him three years ago. I started writing to him at that time. A. I wrote to him three years ago. B. I have been writing to him for three years. C. Three years is long time for me to write to him. D. I have rarely written to him for three years. Câu 8: Last night, I came back home. I saw my son sleeping on the sofa. A. I had came back home last night while my son was sleeping on the sofa B. I have came back home last night while my son was sleeping on the sofa C. I came back home last night while my son is sleeping on the sofa D. I came back home last night while my son was sleeping on the sofa