We______her letter last week.We don't know what has happened

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We______her letter last week.We don't know what has happened to her.
A.must receive
B.must have received
C.oughted to receive
D.ought to have received
感觉是虚拟语气,但是B和D有本应该的意思吗?

确实是需要你语气.本句意思是“我们本来上个礼拜就应该收到她的信.（现在）我们不知道她出了什么事.”must have done sth 指的是“一定做过某事”,是对过去动作的肯定推测； ought to have done sth 指的是“本来应该做某事（但却没做）.所以这题选的是D.

We______her letter last week.We don't know what has happened we don't know what has happened since yesterday since 不是跟延续性 I don't know if you heard about what happened last night wit We don't know when the accident________.A.has happened B.hap he doesn't seem to know what happened last night 根据首字母补充句子：What did your robot do last week?We don't have it I don't know what happened to her. We don't know what to do. what,we,can,don't,learn,know What We Don't Know 歌词 we don't have any class last week. I don`t know where we will go next week