11．The reason for this accident remains apuzzle （迷）．

分析 這次事故的原因仍然是個迷．

解答 答案：puzzle
迷：puzzle；句中有不定冠詞a限定，用名詞的單數(shù)形式即可．

點評 翻譯填空題考查的是詞匯記憶和句意理解能力．解題時，要用理解句意的前提下，注意詞匯的拼寫．

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