问题补充：
Every one of us must know this: we live can we save the earth．
A. by changing the way only
B. by only changing the way
C. only by changing the way
D. by changing only the way
答案：
A. by changing the way only
B. by only changing the way
(答案→)C. only by changing the way
D. by changing only the way
解析：考查倒装句，only+介词短语放在句首，后面接部分倒装句，选C，句意是：我们每个人都必须知道，只有通过改变我们的生活方式，我们才能拯救地球。选C。
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