She _______fifty or so when I first met her at a conference.A、had beenB、must be

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问题 She _______fifty or so when I first met her at a conference.

选项 A、had been
B、must be
C、has been
D、must have been

答案 D

解析 when引导的时间状语从句用了过去时(met)，因此本句是对以往年龄或过去事实的推测，要用“must+have+过去分词”形式，故D正确。

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She_______fiftyorsowhenIfirstmetherataconference.A、hadbeenB、mustbe