题目内容
______on ten years of observation and study, Professor Wang announces that everyone dreams every night, whether they realize it or not.
- A.Basing
- B.Based
- C.Been based
- D.Having based
B
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______on ten years of observation and study, Professor Wang announces that everyone dreams every night, whether they realize it or not.
| A．Basing | B．Based | C．Been based | D．Having based |