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 情态动词题。英语中表示“肯定”的推测,用情态动词must。如果是对现在的推测,用must be/do;对过去的推测,是must have done。这里正是对过去的推测,故[D]正确。
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