<p>This is a very unfair situation. Perhaps you should have told your teacher before you took the test. I don’t think you should be penalized for researching to prepare for a DBQ.</p>
<p>As others have said, it is extremely difficult to not subconsciously include ideas from something you have already been exposed to. You should tell your teacher that you’re very sorry(though I don’t really know what… you should be sorry for), and ask for a retake.</p>