单选题
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
【正确答案】
D
【答案解析】
该题考查情态动词的用法。情态动问+have done表示对过去的推测。句意：“为研究野生动物，这个女生物学家在回来前在非洲呆厂13年。”“哦!她一定克服了许多困难。”答案为D。
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