four hours is a long time为什么要用is

four hours is a long time为什么要用is seven days is a long time为什么要用is Three hours is a long time to s_____ still . 为什么It's a four-foot-long box.=The box is four feet long. “TO hours is a long time to take over a coffee. Mike works very long hours very day.为什么要用hours而不用time? is it enough to have survieved for a long time 为什么用have done 英语单选题Three months is a long time for me .句中为什么用is而不用are?Ther Two months is quite a long time. Never Is A Long Time 歌词 There is a kait and four pictures on the wall.中为什么要用“is”? it is a long time和it is long time 的区别