— Li Fan won the first prize in the national physics competition. — I he was the winner.A

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A. shouldn’t have thought
B. must have thought
C. need have thought
(答案→)D. could never have thought
解析：考查情态动词用法。Shouldn’t have done本不应该做某事，实际上却做了；must have done一定做了某事；need have done本需要做某事；could not have done不可能做了某事；句意：—李凡在国家物理竞赛里获得了第一名。—我不可能想到他是胜利者。故D正确。