2. 外语
  3. ______there is little we can do to modify the weather, we can at least know what kind of weather to expect.

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

admin2010-02-22  45
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
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