it has been since信息详情
从那以后
has been───已经
has been married───已经结婚了
has been on───一直开着
has been doing───到现在为止一直进行（现在完成进行时）
has been in───到过；去过
has been to───曾经去过（某地）
has been hotel───一直住在旅馆里
it is since───是因为
it has───它有
Naturally, we watch the market and the market is better than it has been since 1974 right now," he said.───他说：“很自然，我们留意市场行情，现在的行情是1974年以来最好的。”
benefit of this is it quickly shows how long it has been since you’ve gone to the gym.───这么做的好处是对于已经进行多长时间体育锻炼了，你可以一目了然。
The unemployment rate in the euro zone was 10.2% in September, the highest it has been since 1998.───9月，欧元区的失业率达到10.2%，为1998年以来的最高水平。
The solution is to use the valueOf method on the Date object to see how long it has been since the start of the animation.───解决方案是使用Date对象的valueOf方法确定动画开始了多长时间。
Meanwhile, unemployment is almost 10 percent, and long-term unemployment is worse than it has been since the Great Depression.───与此同时，失业率几乎达到10%，长期的失业情况比上世纪30年代大萧条以来任何时间都糟糕。
The proportion of Americans who think their country should be active in the world (42%) is the lowest it has been since the early 1990s.───认为美国应该在世界上积极作为的美国人比例（42%）是自二十世纪九十年代初以来最低的。
That may be higher than it has been since the mid-1990s, but it is a long way short of the 8. 7% the market was offering back in 1950.───这也许比上世纪90年代中期以来的收益率要高，但却远远低于1950年市场提供8.7%的水平。
The Fed is widely expected to keep its benchmark interest rate where it has been since December -- near zero -- when it meets this week.───外界广泛预计，美联储将在本周会议上维持利率于零附近的低点不变。
How many days it has been since the wedding?───婚禮過去幾天了？