问题描述：
求一个英语单选的解释
_____people are fully aware of the situation in that area,we are havingi difficulty in finding anu volunteers.
A.As B.Since C.While D.When
我就选的C,我想的是虽然人们意识到了那儿的情况（坏的）,我们在招志愿者这一方面还是困难重重.转折关系吧.（说明人们的付出贡献意识不强）
可是答案是A,我就想不通了.有木有人帮我个忙捏?
_____people are fully aware of the situation in that area,we are havingi difficulty in finding anu volunteers.
A.As B.Since C.While D.When
我就选的C,我想的是虽然人们意识到了那儿的情况（坏的）,我们在招志愿者这一方面还是困难重重.转折关系吧.（说明人们的付出贡献意识不强）
可是答案是A,我就想不通了.有木有人帮我个忙捏?
问题解答：
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