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。选项D 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，选项A since用作“因为，既然”意思时，前后两个分句间表因果，而非转折让步关系，不合题意；选项B when意思是“就在那个时候，在…的时候”，引导时间状语从句；选项C unless“如果不，除非”，引导假设状语从句。
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