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Canada has vast areas of wilderness, from the Arctic north, _______ average winter temperatures are ...
题目内容：
Canada has vast areas of wilderness, from the Arctic north, _______ average winter temperatures are usually -20 0C, to the border with the USA in the south, _______ is said to be the longest border in the world not defended.
A. which, where B. whose, which C. where, where D. where, which
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