: Three depressions sign是指:

Three depressions sign产生的原因主要为：

Here were cycles of industrial prosperity which always collapsed into industrial_______. A: ooms B: nightmares C: depressions D: disadvantages

What are the problems the U.S. economy has faced from time to time? A: Inflation B: Depressions C: Recessions D: All of the above

Here were cycles of industrial prosperity which always collapsed into<br/>industrial_______.() A: booms B: nightmares C: depressions D: disadvantages