The adoption of orphans and physically challenged children has been a subject of public
debate a fire in an unregistered orphanage last month.
A. according to
B. in case of
C. ever since
D. such as
网友回答
A. according to
B. in case of
(答案→)C. ever since
D. such as
解析：考查介词短语：A. according to根据B. in case of以防C. ever since自从D. such as例如，句意：自从上个月的一个未注册的孤儿院大火事件后，收养孤儿和身体有残疾儿童一直是公众讨论的主题。选C。