---Where is my pen?
--- I _____it.
A．might loseB．wouldn’t have lostC．should have lostD．must have lost
D
本題考查情態(tài)動詞。從原題中Where is my pen?這一信息句可告訴考生，“筆丟了”，丟的動作是過去發(fā)生的。因此用must + have done表示對過去事實的肯定猜測。
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