______ there is little we can do to modify the weather, we can at least know wha

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问题 ______ there is little we can do to modify the weather, we can at least know what kind of weather to expect.

选项 A、Since
B、When
C、While
D、Unless

答案 C

解析句意：尽管我们在改变天气方面无能为力，但我们至少知道天气未来的变化。while除表示时间外，还可表示转折、让步，意为“尽管，虽然”。该句中其他选项不具备此意。

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