The Amazon rain forest,( )the earth's lungs,converts carbon dioxide in the atmosphere backinto oxyge
考试：MBA考试
科目：英语（在线考试）
问题：
A：functioning as
B：which functioning as
C：functions as
D：functioned as
答案：
解析：
相关标签：
The Amazon rain forest,( )the earth's lungs,converts carbon dioxide in the atmosphere backinto oxyge
VIP会员可以免费下载题库
推荐度：
点击下载文档文档为doc格式
上一篇：Imagine our embarrassment when we saw Mary( ).
下一篇：Television is an instrument of communication,( )us to see us as well as to hear the performer.
