Question

I____ him for a long time. (know, have known, am knowing )

Answer 1

❗❕know is the answer of your question❗❕

HOPE IT HLPS YOU ✌❤❤

Answer 2

Answer:

the answer is: I HAVE KNOWN him for a long time

Explanation:

if the word FOR wasn't there, and it was replaced by the word FROM , then KNOW could have been used.