She______fifty or so when I first met her at a conference.

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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 句意:当我第一次在一个会议上看到她时,她一定有50岁左右。对过去的推测,用过去完成时。答案是D。
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