M: In England today, our schools mixed or single sexed. ,F: Well. There are both. 50 years ago, all schools used to be single sexed. I mean boys only or girls only. Then in the nineteen seventies, many schools changed and became mixed.
(A) M: Many Chinese schools became single sexed due to the gender discrimination. (B) M: So many schools in England became mixed. It was a huge change. (C) M: I didn’t hear you. Please could you tell me again? (D) M: That's why many schools in American became mixed in the 1970s.
B