________ more careful, his ship would not have sunk.A.If the captain wereB.Had the captain beenC.Should the captain beD.If the captain would have been
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B解析因为由主句谓语可判断，表示的是与过去事实相反的情况，所以虚拟条件句中的谓语应用过去完成时，Had the captain been = If the captain had been。