— 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 throughC.ought to have gone throughD.must have gone through
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D解析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