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。