单选题 —He eventually realized his own fault and wanted to reform.
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【正确答案】 B
【答案解析】[解析] 句意:他最后意识到了自己的错误,想要改正。A:枯井抽水,徒劳无功;B:亡羊补牢,为时未晚;C:事后追悔不如事前稳妥;D:祸不单行。根据题意可知选B。