________ theory，everyone must obey the rules，but ________practice，there are a few people who don’t obey the rules.
| A．In；on |
| B．On；in |
| C．In；in |
| D．On；on |
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________ theory，everyone must obey the rules，but ________practice，there are a few people who don’t obey the rules.
| A．In；on |
| B．On；in |
| C．In；in |
| D．On；on |
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