Unfortunately, the research was limited __________ increasing economic profits，__________ protecting the environment.
| A．to; other than |
| B．by; rather than |
| C．to; rather than |
| D．by; more than |
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Unfortunately, the research was limited __________ increasing economic profits，__________ protecting the environment.
| A．to; other than |
| B．by; rather than |
| C．to; rather than |
| D．by; more than |
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