It has gone back and forth between AppleWorks, MS Word, iWork, and OpenOffice for several years.
Your manuscript has been through the mill!
I suggest that you clean it up by converting it to plain text.
In Pages, Menu > Edit > Select All
and then Copy.
Open a text editor, such as TextEdit, and Paste.
You will lose the formatting - and perhaps those black lines?
You may also lose graphics.
Select All and Copy in your text editor, then Paste into a new, blank Pages document.
Any good? Have the black lines gone?
Now reapply the formatting!
Message was edited by: Yellowbox. You may also lose graphics.