5.D 考查虚拟语气.Had I been a little more careful是If I had been a little more careful的省略倒装形式.由此可知是对过去事实的假设.所以主句谓语用wouldn’t have done.句意为:如果我再细心点.就不会犯这么愚蠢的错误了. 查看更多

 

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