—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(dòng)詞的用法。情態(tài)動(dòng)詞+have done表示對(duì)過去的推測(cè)。句意為:“為研究野生動(dòng)物,這個(gè)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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