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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