Choose the sentence that best completes each of the following exchanges.Câu hỏi Tom and Mary are talking together. Tom: “___________” - Mary: “That's a good idea." A. Why not take a trip to the Citadel in Hue this summer holiday? B. What happened to the Citadel in Hue after the storm? C. Have you heard about the Citadel in Hue? D. How can we book a tour to the Citadel in Hue this summer holiday?