9. She is very intelligent. She (can not have thought/ couldn't have thought) that!<br/><b>can not have thought</b><br/><br/>Why is this the correct answer? I got it from here: <a href="http://esl.about.com/library/quiz/blgrquiz_pastforms_answer.htm"><a href='http://esl.about.com/library/quiz/blgrquiz_pastforms_answer.htm' target='_blank' rel='nofollow'>http://esl.about.com/library/quiz/blgrquiz_pastforms_answer.htm</a> </a><br/><br/>Thank you!