Three years ____ ____ since he joined the army 填have passed ,have不对,passed对的.
问题描述：
Three years ____ ____ since he joined the army 填have passed ,have不对,passed对的.
答
这个不是两个空吗？两个空 填一个词？
答
应该填 has passed
如果是时间作主语的话,不管是多长时间都看做是整体