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  3. She______fifty or so when I first met her at the conference.

She______fifty or so when I first met her at the conference.

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问题 She______fifty or so when I first met her at the conference.
选项 A、must be
B、had been
C、could be
D、must have been
答案D
解析 本题考查情态动词的用法。说话者是在对过去情况的一种猜测，即开会时，因此应用情态动词加不定式完成时，答案是D。
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考研英语一

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