问题描述: 高中英语 6题d b的区别 1个回答 分类:英语 2014-10-11 问题解答: 我来补答 should have done 本应当.would have done 【虚拟语气常用】结合前文【had they been done by hand】,可知是虚拟语气 展开全文阅读