1. 语态和时态Do you see those people on the little sandy island?Yes, they _ handkerchiefs for the last half hour. I wonder why.A. were waving B. waved C. had waved D. have been waving【正确答案】D【高考考点】考查动词时态。现在完成进行时：表示一个从过去某一时刻开始的动作，一直延续到说话时还在进行或刚结束，句中常出现用for, since, how long等引导的时间状语。e.g. His telephone has been ringing for a long time.e.g. It has been raining since last Sunday. e.g. How long have you been wearing glasses?【题干句意】“你有没有看见那些在小岛上的人？”“是的，我看见了。他们在过去的半小时里一直在挥手帕，我不知道为什么。”【详细解析
