________ on ten years of observation and study, Professor Wang announced that everyone dreams every night，whether they realize it or not.
| A．Basing | B．Based |
| C．Been based | D．Having based |
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________ on ten years of observation and study, Professor Wang announced that everyone dreams every night，whether they realize it or not.
| A．Basing | B．Based |
| C．Been based | D．Having based |
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