ALL I KNOW ABOUT THE PLAN IS THAT THEY ARE GOING TO SING THE SONG...

267.All I know about the plan is that they are going to sing the song together.

A. As a matter of fact, they together planned the singing.

B. They are going to sing the song together as planned.

C. As soon as they have planned the song, they will sing it together.

D. As far as I know, they are going to sing the song together.