题文
But _____,if we ignore pollution, we will suffer a lot from it because there will be many environmental problems.
| A．on the one hand |
| B．on the other hand |
| C．in one hand |
| D．in the other hand |
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But _____,if we ignore pollution, we will suffer a lot from it because there will be many environmental problems.
| A．on the one hand |
| B．on the other hand |
| C．in one hand |
| D．in the other hand |
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