---- The woman biologist stayed in Africa studying wild animals for 13 years bef

题型：不详难度：来源：

---- 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

检查考生对情态动词表示判断的掌握和运用能力。首先，对过去发生事情的判断用情态动词+完成形式；其次，ought to have done 表示“本应该……”，即事情没有做，所以不符合语境。must have done 表示“肯定……”。