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

分析 電話響了但是我沒有聽見．我肯定是睡著了．

解答 答案是把should改為must．本題考查表示推測的情態(tài)動詞，should have done表示"本該做而實際上沒有做"；must have done表示"肯定已經(jīng)…"，是對過去的或已經(jīng)發(fā)生的事件的推測．根據(jù)句意，電話響了，我卻沒有聽見，故推測"我肯定是睡著了"，故答案是將should 改為must．

點評 本題改錯考查"情態(tài)動詞+have done"的區(qū)別，要在理解掌握各"情態(tài)動詞+have done"的含義的基礎上結合具體語境判斷．

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