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— 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
此句是对已经发生的事情的肯定的猜测,故排除A、B。根据句意,排除C。故答案为D。
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