问题补充：
With efforts conservation, we may believe that people enjoy a healthy life without the environment around them .
A. focused on; suffering
B. focusing on; suffering
C. focused on; being suffered
D. focusing on; suffered
答案：
A. focused on; suffering
B. focusing on; suffering
C. focused on; being suffered
D. focusing on; suffered
解析：
focus efforts on sth致力于…宾语efforts提前，故用被动形式，构成with sth done结构。 同理构成without sth being done.without后接现在分词形式的被动。
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