单项选择题

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

[A] Since
[B] When
[C] Unless
[D] While
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单项选择题
In no case ______ ever betray your better nature.
[A] should you
[B] you should
[C] shall you
[D] you shall
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