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---Where is my pen?
--- I _____it.
A.might loseB.wouldn’t have lostC.should have lostD.must have lost
D
本题考查情态动词。从原题中Where is my pen?这一信息句可告诉考生,“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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