2. 外语
  3. ______ there is little we can do to change the reality, we can not be totally at the mercy of the harsh environment.

______ there is little we can do to change the reality, we can not be totally at the mercy of the harsh environment.

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问题 ______ there is little we can do to change the reality, we can not be totally at the mercy of the harsh environment.
选项 A、Since
B、When
C、Unless
D、While
答案D
解析 连词用法题。while除表示时间外，还可表示转折、让步，意为“尽管，虽然”。其他选项中，since用作“因为，既然”意思时，前后两个分句间是因果关系，而非转折让步关系，不合题意；when意思是“就在那个时候，在……的时候”，引导时间状语从句；unless“如果不，除非”，引导条件状语从句。
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