Answer:
This are the answers for your Questions
Explanation:
A) You know, you could have finished your project if you hadn't gone to play at your friend's house.
B) You could have finished your project if you had not gone to play at your friend's house.
C) You could've finished your project if you hadn't gone to play at your friend's house.
I believe it is the last one
Don't take my word for it, but it seems more simple than the others.
a
my best guess should be "B"
