分类：教育/科学-外语学习-英语考试
问题：英语选择题It（）morethantwoandahalfyear 
It（             ）more than two and a half years since I came to this school.

我填的是was，答案是is

请解释一下！

回答：记住句型: It is / has been + 时间＋since + 主语＋ did + sth.所以你的答案该是：is 或has been