精选优质文档-倾情为你奉上一、情态动词:53. She (D fifty or so when I first met her at a conference. (2009A. had been B. must be C. has been D. must have beenKey : 情态动词 must 表示很有把握的推断。 对于现在事情的肯定推断用 must do ,而对过去的推断,要用 must have done.本句是对她过去年龄的肯定推测。61. Arent you tired? I(A you had done enough for today.(2009A. should have done B. must have doneC .might have done D .could have doneKey: should have done 意思是本来应该做某事, 而实际没做, 符合此处语义逻辑 关系。 Must have done表示对过去事情的猜测, might 与 may 意思相同,但可能 性更小。 多用于虚拟语气结构中。
