A. They are talking about the subway project. B. They are talking about the changes of their city. C. They are talking about the plan of a new bus line. D. They are talking about how to improve the transport system of their city.
A. They are talking about the subway project.
B. They are talking about the changes of their city.
C. They are talking about the plan of a new bus line.
D. They are talking about how to improve the transport system of their city.