<p>Its SAT grammar, the SAT writers have different grammar rules, then the ones were taught in High School. I would review this: <a href=“http://www.thecriticalreader.com/general-grammar-tips/sat-grammar/item/264-complete-sat-grammar-rules.html”>http://www.thecriticalreader.com/general-grammar-tips/sat-grammar/item/264-complete-sat-grammar-rules.html</a> :)</p>