问题
选择题
When _____ comes to saving energy, big changes start with small steps, like turning off the lights. [ ]
A. that
B. this
C. it
D. one
答案
答案：C
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When _____ comes to saving energy, big changes start with small steps, like turning off the lights. [ ]
A. that
B. this
C. it
D. one
答案：C