OG13--SC1 In a review of 2000 studies of human beavior that date back to the 1940s, two swiss (psychologists, declaring that since...) 括号部分是选项,A是 psychologists, declaring that ;E是 psychologists declared that 弱弱问一句,为啥-ing不对... OG解释:the subject of the sentence, two swiss psychologists, need a main verb. The -ing verb form declaring cannot ,on its own, be the main verb... 谢谢各位呀···还有就是这个算是哪块的问题,我必须得系统看看了