问题补充：
．—Well, Kate, I’m sorry, but I have to leave.
---. I hope to hear from you soon.
A. Keep in touch
B. Have s good time
C. Walk slowly
D. So am I.
答案：
(答案→)A. Keep in touch
B. Have s good time
C. Walk slowly
D. So am I.
解析：考查交际用语。Keep in touch保持联系。句意：——嗯，凯特，对不起，我要走了。——保持联系，我希望很快收到你的来信。
