问题补充:
Some so-called climate travelers in one place for a few months and then move on to some other places as the weather changes.
A. have stayed
B. are staying
C. stay
D. stayed
答案:
A. have stayed
B. are staying
(答案→)C. stay
D. stayed
解析:这里是讲的是客观情况,故用一般现在时。从下文的“as the weather changes”我们也可以知道用一般现在时。句意:一些所谓的气候旅行者在一个地方呆上几个月,然后随着天气的变化又迁移到其它一些地方。