________ on ten years of observation and study, Professor Wa..
________ on ten years of observation and study, Professor Wang announced that everyone dreams every night,whether they realize it or not.A.BasingB.BasedC.Been basedD.Having based
When we visited that city again ten years later, we found it..
When we visited that city again ten years later, we found it changed so much that we could hardly _____ it.A. remember B. think about C. believe D. recognize