16．She called me yesterday evening but I didn't hear it．Imust have been asleep．

分析 她昨天晚上給我打電話，但是我沒聽到，我一定是睡著了．

解答 答案：must
解析：根據(jù)前面的"她昨天晚上給我打電話，但是我沒聽到"可知，她打電話來的時候我"一定"是睡著了，要不然就聽到了電話聲；故本題答案為must"一定"一詞．must have done意為"一定做過某事"，用于對過去發(fā)生的事情的肯定推測．

點評 本題考查單詞填空，做此類題目時一定要仔細(xì)分析句子結(jié)構(gòu)，確定所缺成分；再結(jié)合所給的中英文提示及題干中其他要求填入正確單詞．

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