a may have b needn't have c couldn't have d must have

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/15 05:52:39

a may have b needn't have c couldn't have d must have
i did not know you were dood friends
you ___ i have known her scinece she moved here you were abroad then
选什么
为什么
考查什么语法
怎么翻译

正确答案：选C.couldn't have
即：I did not know you were good friends.
You couldn't have.I have known her since she moved here.You were abroad then.
翻译：我原来不知道你们是好朋友.
你不可能知道.自从她搬到这儿我就认识她了,那时你出国了.
解析：首先纠正一下你的句子中有拼写错误的单词,dood应该是good,science应该是since 自从.couldn't have done 是指对过去做过的事情的否定推测,表示不可能...的意思；根据句意应该选C项,指原来不可能知道这件事.而may have done 是指对过去做的事情的肯定推测,原来有可能...；needn't have done 是指过去本不应该做的事情却做了；must have done 是指对过去做的事情的肯定推测,而且可能性要比may have done要大.
有不明白的请继续追问,

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