We decide to make ________ a rule for us room-mates to turn off the lights at 10:30 pm.
| A．that | B．this |
| C．it | D．one |
We decide to make ________ a rule for us room-mates to turn off the lights at 10:30 pm.
| A．that | B．this |
| C．it | D．one |
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