When ____ comes to saving energy, big changes start with small steps, like turning off the lights....
2023-02-12 19:23:42 171次 天津市南开中学2010届高三下学期5月模拟考试 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
When ____ comes to saving energy, big changes start with small
steps, like turning off the lights.A.
that B.
this C.
it D.
one
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