分析 has been missing for half a year.
解答 答案:has been missing for half a year.
结合句意失踪miss的动作发生在过去,一直持续了半年for half a year,还会持续下去,故用现在完成进行时have/has+been+现在分词,主语the ship 三单,故has,故答案是has been missing for half a year.
点评 现在完成进行时,是英语中,动词的一种基本时态,其构成为:主语+助动词(have/has)+been+动词的现在分词+其他成分.表示动作从某一时间开始,一直持续到现在,或者刚刚终止,或者可能仍然要继续下去.(与since,for连用时,要用连续性动词,不可用瞬间动词,但连续性动词常常表示动作会进行下去)
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