12．When you got lost in the forest，I guess，you_____very frightened．（　�。�
A．must beB．must have been
C．shouldD．should have been

分析 當你做森林中迷路了．我猜你一定很害怕．

解答 答案：B  
題干表示的是對過去情況的推測，用情態(tài)動詞加完成時態(tài)來表示；must have been very frightened 表示"過去一定很害怕"．故選B．

點評 情態(tài)動詞的用法是英語中�？嫉恼Z言點．通�？疾榈姆绞接刑摂M和推測，本題考查的是情態(tài)動詞的推測用法．學習時要注意積累．

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