This new method not only saves time but also saves energy ________ operating on two batteries instea

This new method not only saves time but also saves energy ________ operating on two batteries instea

题目
This new method not only saves time but also saves energy ________ operating on two batteries instead to four.
A) in
B) on
C) by
D) for
答案
C,by通过什么方式
举一反三
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奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
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