In order to make our city green, _________.
| A．it is necessary to have planted many trees | B．many more trees need to plant |
| C．we must plant more trees | D．our city needs more trees |
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In order to make our city green, _________.
| A．it is necessary to have planted many trees | B．many more trees need to plant |
| C．we must plant more trees | D．our city needs more trees |
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