Complete the sentence with the appropriate clause: It was long since ___

Complete the sentence with the appropriate clause: It was long since ____

A I saw you

B I see you

C I had seen you

D I have seen you

Correct Answer: Option C

Since যুক্ত প্রথম clauseটি past indefinite হলে দ্বিতীয় clauseটি past perfect tense হয় ।