8．The officer promised theywould keep（keep） searching for the missing plane until it was found．

分析 翻譯：軍官答應(yīng)他們會繼續(xù)尋找失蹤的飛機，直到找到它．

解答 根據(jù)until it was found說明應(yīng)用將來時，再由promised 可知應(yīng)用過去將來時，故填：would keep．

點評 首先根據(jù)句意判斷用一般將來時，再根據(jù)主句過去時，從句應(yīng)用相應(yīng)的過去時，即可填出．

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