She______fifty or so when I first met her at the conference.A、must beB、had been

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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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She______fiftyorsowhenIfirstmetherattheconference.A、mustbeB、hadbeen