To live a low﹣carbon life， we must remember ____ the lights when we leave the room．（ ）
| A． |
to turn off |
| B． |
turning off |
| C． |
not to turn off |
To live a low﹣carbon life， we must remember ____ the lights when we leave the room．（ ）
| A． |
to turn off |
| B． |
turning off |
| C． |
not to turn off |
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