______ 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

解析逻辑关系题。本句的意思是：尽管我们在改变天气方面无能为力，但我们至少(at least)可以知道天气未来的变化。本句的关键点是：while除引导时间状语从句外，还可引导让步状语从句，意为“尽管，虽然”。

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