—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　
該題考查情態(tài)動詞的用法。情態(tài)動詞+have done表示對過去的推測。句意為:“為研究野生動物,這個女生物學(xué)家在回來前在非洲待了13年�！薄芭叮∷欢ǹ朔嗽S多困難。”
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