The key      the earth is to change the way      we live.
A．to save; /B．to saving; /
C．to save; howD．to saving; how
B
本題考查名詞及定語(yǔ)從句。The key to doing sth.做某事的關(guān)鍵，to為介詞；定語(yǔ)從句the way為先行詞，關(guān)系詞為that/in which/\，選B。
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