______ on ten years of observation and study, the theory shows that every one dreams every night, whether they realized it or not.
| A．Basing | B．Based | C．Being based | D．Having based |
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______ on ten years of observation and study, the theory shows that every one dreams every night, whether they realized it or not.
| A．Basing | B．Based | C．Being based | D．Having based |
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