问题
选择题
According to some theories ________ from psychoanalysis, life is supposedly easier; and more pleasant when anxiety is overcome.
A．obtain
B．obtaining
C．to obtain
D．obtained
答案
答案：D
本题考查的是非谓语动词，由于逻辑主语theories与动词obtain是被动关系，故选择表示被动含义的D（-ed分词）