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
