________inthecageforhalfaday,thebirdbecamehungry.
A.Being keptB.Having keptC.Having been keptD.Have been kept在线课程C
解析：
这题考查现在分词完成式做状语的用法,因为the bird是被关在笼子里半天了，才感到饿，有先后关系，选C。