问题

Alow-carbon(低碳)lifestylehas an effect ourdaily life.More and more attention has been paid toEnergies these days.
A: in;save
B:in;saving
C:on;save
D:on;saving
B:in;saving
C:on;save
D:on;saving
正确答案是:
同类题型
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s MrSmith, ________ I think has something interestingto tell you