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 throughB．might go through?
C．ought to have gone throughD．must have gone through?
D　
该题考查情态动词的用法。情态动词+have done表示对过去的推测。句意为:“为研究野生动物,这个女生物学家在回来前在非洲待了13年。”“哦！她一定克服了许多困难。”
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