问题
选择题
The key the earth is to change the way we live.
A．to save; /
B．to saving; /
C．to save; how
D．to saving; how
答案
答案：B
本题考查名词及定语从句。The key to doing sth.做某事的关键，to为介词；定语从句the way为先行词，关系词为that/in which/\，选B。
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