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，用must have done。这里是对过去的推测，故[D]正确。

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She______fiftyorsowhenIfirstmetherataconference.A、hadbeenB、mustbe