问题补充：
单选题BeforethegamestartedAliensfriendsbelievedhewas___buthedidn feel___.Thenafterthefirsttenminutes,hebegantotakeheart.A.sure to win; sure to successB.sure of success; sure of itC.sure to win; sure about thatD.sure about winning; sure to win
答案：
C
