When people cut down big trees, new trees should be planted. ,they will have no trees to cut down in the future.
| A．If not | B．If so | C．If no so | D．If don’t |
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When people cut down big trees, new trees should be planted. ,they will have no trees to cut down in the future.
| A．If not | B．If so | C．If no so | D．If don’t |
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