【题目】—How much do you know about the Youth Olympic Games to be held in Nanjing?
—Well, the media ________ it in a variety of forms.
A.cover
B.will cover
C.have covered
D.covered

【答案】C
【解析】句意：——关于将在南京举办的青奥会你了解多少？——嗯，媒体已经用各种形式进行了报道。根据句意可以判定出，本题用现在完成时态，强调过去的事情对现在的影响还存在。故C正确。