题目内容
—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
D
解析:
“must have + 动词-ed形式”表示“(过去)一定……”,是对过去发生的动作的肯定判断。根据上文studying wild animals for 13 years可判断出一定遇到了许多困难。
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