She______fifty or so when I first met her at a conference.A、had beenB、must beC

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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

解析语法，"推断"的表达。must have been表对过去情况的推测；must be表示对现在情况的推测。由题中的met可知是过去。我第一次见到她是在一次会议上，她那时肯定有50左右了。

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She______fiftyorsowhenIfirstmetherattheconference.A、mustbeB、hadbeen