节约用水用电句型 — 英语选择题

明明刷牙时让水龙头一直开着，离开房间时没有关灯。哪条建议能分别帮助他节约用水和用电？ A. We should leave the tap on and turn off the lights. B. We should turn off the tap and leave the lights on. C. We should turn off the tap and turn off the lights. D. We should leave the tap on and leave the lights on.