Where is my pen? I_____it.A、might loseB、would have lostC、should have lostD、mu

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问题 Where is my pen? I_____it.

选项 A、might lose
B、would have lost
C、should have lost
D、must have lost

答案 D

解析从原题中Where is my pen?这一信息句可知， “笔丢了”，丢的动作是过去发生的。因此用must+have done表示对过去事实的肯定猜测。

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