____in the mountains for a week,the two students were finally saved by the local police.A.Having lost B.Lost C.Being lost D.Losting请附上说明,

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____in the mountains for a week,the two students were finally saved by the local police.A.Having lost B.Lost C.Being lost D.Losting请附上说明,

____in the mountains for a week,the two students were finally saved by the local police.A.Having lost B.Lost C.Being lost D.Losting请附上说明,
____in the mountains for a week,the two students were finally saved by the local police.
A.Having lost B.Lost C.Being lost D.Losting
请附上说明,

____in the mountains for a week,the two students were finally saved by the local police.A.Having lost B.Lost C.Being lost D.Losting请附上说明,
选A
解析:两名学生在山里走失了,这件事情毫无疑问是发生在他们被救出之前的,而题目中他们被警察救出用的是过去时态,那么前半句发生的时间就属于过去的过去,就要用过去完成时.
两半句的主语都是两个学生,所以前半句的主语(the two students) 和谓动词(be)就可以省略,而且动作的发生与主语是主动的关系,所以用的doing形式.