问题
选择题
Eric helped to explain some things about community medicine to Barack, and of course his ideas were affected by Barack _____ health care.
A．thought about
B．to think about
C．think about
D．thinking about
答案
答案：D
题目分析:考查非谓语动词。根据结构可知by后面是动名词做宾语，Barack是动名词的逻辑主语，而其他三个选项不能做介词的宾语，故D选项正确。句意：埃里克帮忙向贝拉克解释有关社区医疗的一些事情，当然他的想法受贝拉克对医疗保健看法的影响。