---The woman biologist stayed in Africa studying wild animals for 13 years before she returned．

---Oh, dear! She ______ a lot of difficulties!


  1. A.
    may go through
  2. B.
    might go through
  3. C.
    ought to have gone through
  4. D.
    must have gone through
D
前者所說(shuō)句意為“這位女生物學(xué)家回來(lái)之前，在非洲住了13年研究野生動(dòng)物”。因此后者所說(shuō)“她一定渡過(guò)了很多難關(guān)”。這一過(guò)程應(yīng)該是過(guò)去的事情，用情態(tài)動(dòng)詞對(duì)過(guò)去情況進(jìn)行推測(cè)，應(yīng)該用“情態(tài)動(dòng)詞+have done”這一結(jié)構(gòu)，故排除A和B項(xiàng)；ought to have done相當(dāng)于should have done，意為“本應(yīng)該做某事但事實(shí)上沒(méi)有做”，不符合題意，故排除C項(xiàng)；must have done意為“一定已經(jīng)做了……”，符合題意。
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(     )3. A. come          
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(     )5. A. always        
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(     )16. A. may          
(     )17. A. my            
(     )18. A. still        
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B. mistakes          
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