Having an outdoor meal is always fun, but it can also be damaging to the planet if ______.
| A．planned not carefully | B．not planning carefully |
| C．not planned carefully | D．not to be planned carefully |
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Having an outdoor meal is always fun, but it can also be damaging to the planet if ______.
| A．planned not carefully | B．not planning carefully |
| C．not planned carefully | D．not to be planned carefully |
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