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

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

A. may go through                       B. might go through

C. ought to have gone through             D. must have gone through

D


解析:

檢查考生對情態(tài)動詞表示判斷的掌握和運(yùn)用能力。首先，對過去發(fā)生事情的判斷用情態(tài)動詞+完成形式；其次，ought to have done 表示“本應(yīng)該……”，即事情沒有做，所以不符合語境。must have done 表示“肯定……”。

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