This new method not only saves time but also saves energy ________ operating on two batteries instead to four.A) inB) onC) byD) for

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• This new method not only saves time but also saves energy ________ operating on two batteries instead to four.
• This new method not only saves time but also saves energy ________ operating on two batteries instead to four.A) inB) onC) byD) for
• They reached a______ (decide) at the meeting yesterday.
• My wife and I are walking along the banks of the river.我和妻子正沿河岸走着.请问bank为什么要加s呢?前后文是Here is another photograph of the village.My wife and I are walking along the banks of the river.We are on the left.There is a boy in the water.He is swiming across the river,