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When ___ comes to saving energy , big changes start with small steps , like turning off the lights.          
A.thatB.this C.itD.one
C
考察代词。That 特指可数名词单数和不可数名词  this代指后文提到的事物  it代指上文提到的同一个事物,此处是when it comes to 固定结构,意为当涉及到  one 泛指可数名词单数。
句意为,当涉及到节约能源的时候,小措施能产生巨大变化,比如关灯。
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