Question

I _____ my friend for a few years before I joined the school with him.


a. know
b.knew
c.have known
d.had known​

Answer 1

Answer:

I Knew my friend for a few years before I joined the school with him.

Answer 2

Answer:

d. had known

Explanation:

had is used because -the "had" is a past-tense state-of-being verb.

hope it helps !!