Researchers claim to have found the first proof getting a regular eight hours a night really does make you appear healthier and more attractive.
A. as
B. that
C. how
D. which
网友回答
A. as
(答案→)B. that
C. how
D. which
解析：当先行词前有限制性修饰语时,引导词用that,句子总先行词proof证明前有限制性修饰词first,故用that,研究人员声称他们找到了第一个证据,每晚按规律休息8小时,会使你显得更健康,更有吸引力.