【题目】I can’t believe that they ______ in the mountains for three days now! They must be so frightened.
A. have been missing B. have got lost
C. have lost D. have missed
在线课程【答案】A
【解析】
试题分析：考查动词时态。句意：我不能相信他们在大山里失踪了3天了！他们肯定很害怕。Lost是瞬间动词，不能用于一个时间段，根据three days now可知是从现在算起已经有3天了，是一段延续性的时间，故选A项。