The radio club often plays songs by students and gives messages to keep parents of the latest news.
A. sung, exchanged
B. sang, broadcasted
C. singing, approved
D. sung, informed
网友回答
A. sung, exchanged
B. sang, broadcasted
C. singing, approved
(答案→)D. sung, informed
解析：第一空sing与songs之间是被动关系，这是一个过去分词短语作定语，故排除BC；inform sb of 告知某人某事，这里parents与inform之间是被动关系，故选D。