Before the game started, Allen's friends believed he was ________ but he didn't feel ________.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
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C解析导解：be sure of/about(doing) sth.表示“相信，有……的把握”，be sure to do则表示对外界的判断，“一定会……”．