Answer :

Well, say the question aloud and try to figure it out. 
.....if he found the overdue library book, or didn't he look
.....if he found the overdue library book , but didn't he look?
.....if he found the overdue library book, and didn't he look?

I think that personally, or  fixes that up pretty good. ;)
From one Smartie  to another- BubbleSmartie11

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