2. 外语
  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 对过去肯定的推测，用must have done形式，故答案为D。
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