1.Which one following sentence is puntuated correctly.

A.I saw many of my friends,that I had knew from high school.
B.Work was especially hard today,Ihad to train someone new to the job
C.I often carry a cellphone with me,it helps if someone is trying to reach me.
D.If I had arrived earlier,Iwould't have missed the opening act.

4 answers

Make sure you let us know what YOU THINK; then someone here will be happy to comment and explain.
PS -- Don't forget to put a space after each comma.
I think it is D.
If I had arrived earlier,I would't have missed the poening act.
(It has two parts)
Yes, it's D.