She______fifty or so when I first met her at the conference. (2009年考试真题)A、must b

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问题 She______fifty or so when I first met her at the conference. (2009年考试真题)

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

答案 D

解析 本题考点为情态动词must+have done,表示对过去某种情况肯定性的推测。
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