题目内容

17．The telephone rang but I didn't hear it．I should have been asleep．should改为must．

分析 电话响了但是我没有听见．我肯定是睡着了．

解答 答案是把should改为must．本题考查表示推测的情态动词，should have done表示"本该做而实际上没有做"；must have done表示"肯定已经…"，是对过去的或已经发生的事件的推测．根据句意，电话响了，我却没有听见，故推测"我肯定是睡着了"，故答案是将should 改为must．

点评 本题改错考查"情态动词+have done"的区别，要在理解掌握各"情态动词+have done"的含义的基础上结合具体语境判断．

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