题目内容

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 你的父母真的为你焦急；你不应该一句话不说就离开了家．

解答 答案是B．本题考查"情态动词+have done"的结构．根据语境可知题干中说明的是过去的事，对过去的事件的说明用"情态动词+have done"的结构，故排除A和D；needn't have done是虚拟语气，表示"本不必做而实际上却做了"；shouldn't have done是虚拟语气，表示"本不应做但事实上做了"；根据句意可知，你"本不应该"一句话不说就离开了家，由此判断答案选择B．

点评 在掌握虚拟语气的规则的基础上，判断题干属于什么类型的虚拟，然后根据语境，选用恰当的动词形式表达虚拟．

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