9．我們想知道他參加海軍多長時間了．
We wonder howlong he has been a member of the navy．

分析 long he has been a member

解答 答案：long he has been a member．
首先通過中英文句子的比對，可知英文句子中缺少"參加海軍多長時間"的表達． 本題中，設空處所在的句子是一個賓語從句，用陳述語序，"多長時間"是how long，結合句意用現(xiàn)在完成時，構成是：have/has+動詞的過去分詞，由于動詞join"參加"是一個非延續(xù)性動詞，所以要改為表示狀態(tài)的詞才可以跟時間段連用，結合設空處后面的of the navy，用短語be a member of，故答案為：long he has been a member

點評 做這類題型，首先根據(jù)所給漢語明確句子所要考查的單詞或短語的拼寫，再結合相關語法知識對單詞或短語做出形式上的變化．

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