问题补充：
— Its late. I have got to leave now.
— OK. .
A. Thank you
B. Don worry
C. Im sorry for it
D. Take care
答案：
A. Thank you
B. Don worry
C. Im sorry for it
(答案→)D. Take care
解析：上文意思是晚了，我现在必须要走了。下文意思是好的，保重。Thank you 意思是谢谢Don worry别担心Im sorry for it 我感到难过Take care意思是保重。故选D，最符合题意。
