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英语【单选】11——The woman biologist stayed in Africa studying wild

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英语【单选】11
——The woman biologist stayed in Africa studying wild animals for 13 years before she returned.
——Oh,dear!She____a lot of differents!
A.may go through
B.might go through
C.ought to have gone through
D.must have gone through
为什么选【D】?
英语【单选】11——The woman biologist stayed in Africa studying wild
D.的意思是必须经历,上面语气不坚定,自己用排除法一看就知道了,ABC都是一个意思,第四个不同