题目

—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 答案：D 解析: 由上文的stayed可知，此题是对过去情况有把握的肯定推测。句意为“那个女生物学家呆在非洲研究野生动物13年才回来。”“天啊！她一定经历了不少苦难！”

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