In American culture, when saying Goodbye to the host or hostess, the visitor may use the following expressions
选项：

A: Well, I’d better let you have some sleep
B: Tomorrow, you have to get up early, I must go now
C: I’ll have to go. Tomorrow I’ll go to work
D: I must say good-bye. My wife is waiting for me at home
E: We have to say goodbye now. We enjoyed the evening very much. Thanks a lot
F: I think I’d better be leaving now. It’s very nice to have a talk with you.