64.Had it not been for his carelessness, Davidfirst prize in the mathematics contest.

A. would win

B. would have won

C. will win

D. won

正确答案：B

解析：

64.【翻译】如果不是粗心大意，大卫就获得数学竞赛的一等奖了。【精析】B本旬包含-个省略If的非真实条件句。根据句意和从句中的Had it not been可知，本句是对过去情况的假设，所以主句谓语动词应用"would/could/should/might have +过去分词”的形式。故选B。

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