8．Your parents were really anxious about you．
  You           home without saying a word．（　　）
A．mustn'tB．shouldn't have left
C．couldn't have leftD．needn't leave

分析 你的父母真的為你焦急；你不應該一句話不說就離開了家．

解答 答案是B．本題考查"情態(tài)動詞+have done"的結(jié)構(gòu)．根據(jù)語境可知題干中說明的是過去的事，對過去的事件的說明用"情態(tài)動詞+have done"的結(jié)構(gòu)，故排除A和D；needn't have done是虛擬語氣，表示"本不必做而實際上卻做了"；shouldn't have done是虛擬語氣，表示"本不應做但事實上做了"；根據(jù)句意可知，你"本不應該"一句話不說就離開了家，由此判斷答案選擇B．

點評 在掌握虛擬語氣的規(guī)則的基礎上，判斷題干屬于什么類型的虛擬，然后根據(jù)語境，選用恰當?shù)膭釉~形式表達虛擬．

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