Mark, I have not seen you in a long time how have you been ?Salutation
This is a form of Salutation, that refers to an expression of greeting, goodwill, recognition, or courtesy by word or gesture to someone.
Mark, I haven't seen you in a long time. How have you been?
kase d nman Pweding was seen Kase nangyari na ng matagal
D. Haven't seen
Explanation: The second statement entails a positive remark, in this case, we should use the negation "haven't seen" to connect the two sentences.