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    13．I can't find my key．Itmust have been left in my office．（leave）
    我找不到我的钥匙，它肯定是忘在我的办公室了．

    分析 我找不到我的钥匙，它肯定是忘在我的办公室了．

    解答 答案：must have been left
    肯定：must；把某物忘在某地：leave sth+介词短语表示地点；句中leave与主语it之间构成动宾关系，要用被动；句意表达的是推测，对过去的推测要用情态动词加完成时态来构成．

    点评 翻译题在解题是首先要确定好句子的时态，然后要把握好短语表达，最后要注意句子结构．

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