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(huì)繼續(xù)尋找失蹤的飛機(jī)，直到找到它．

解答 根據(jù)until it was found說(shuō)明應(yīng)用將來(lái)時(shí)，再由promised 可知應(yīng)用過(guò)去將來(lái)時(shí)，故填：would keep．

點(diǎn)評(píng) 首先根據(jù)句意判斷用一般將來(lái)時(shí)，再根據(jù)主句過(guò)去時(shí)，從句應(yīng)用相應(yīng)的過(guò)去時(shí)，即可填出．

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