单选题Thousands of athletes ___

问题补充：

单选题Thousandsofathletes_______inmanycountrieswillcompete________medalsintheOlympicGamesinBeijing.A.involved; inB.involving; byC.to involve; againstD.involved; for

答案：

D解析句意：在许多国家涉及到的成千上万名运动员将为了夺取金牌参加北京奥运会。be involved in 涉及，卷入，involved in在这作定语，compete for 为了什么参加比赛。故选D。