题目内容
-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
通过上下文可知空格处应填“她一定经历了很多困难”,表示对过去情况的肯定推测用must have done形式。
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