她把每个字都说得那么清楚，我确信即使不懂英语的外国人也能听懂。
【正确答案】：
SHE SPOKE EACH WORD WITH SUCH CLARITY THAT I WAS CERTAIN A FOREIGNER WHO DIDN’T UNDERSTAND ENGLISH COULD HAVE UNDERSTOOD HER.   
【题目解析】：考点：clarity：清晰； certain：确信的；could have done：本应该。句子结构：that引导定语从句修饰clarity，who引导定语从句修饰foreigner。