52. Mary is ___D___ hardworking than her sister, but she failed in the exam.A. no soB. no moreC. not lessD. no less解析：no less + adj. than … =as … as…， 意思为：和…… 一样……句意：Mary和她妹妹一样学习很勤奋，可她考试并没有及格。no more … than …意思为：和…… 一样不……Mary is no more hardworking than her sister. 句意：Mary 和她妹妹一样学习不勤奋。