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(dāng)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(duì)過(guò)去情況的推測(cè)，用情態(tài)動(dòng)詞加完成時(shí)態(tài)來(lái)表示；must have been very frightened 表示"過(guò)去一定很害怕"．故選B．

點(diǎn)評(píng) 情態(tài)動(dòng)詞的用法是英語(yǔ)中�？嫉恼Z(yǔ)言點(diǎn)．通常考查的方式有虛擬和推測(cè)，本題考查的是情態(tài)動(dòng)詞的推測(cè)用法．學(xué)習(xí)時(shí)要注意積累．

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