【题目】Sometimes I act as a listening ear for fellow students _______ what is bothering them
A. to talk over B. talked over
C. talk over D. having talked over
在线课程【答案】A
【解析】
试题分析：talk over讨论，根据分析，可知act as a listening ear for fellow student to do sth中的to do sth是作student的宾语补足语。句意：有时我充当一个倾听者来倾听我的同学们讨论他们的烦心事。故选A。