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The fire, ______ is still unknown, was concentrated at an altitude of about 3,800 meters, in complex...
题目内容：
The fire, ______ is still unknown, was concentrated at an altitude of about 3,800 meters, in complex terrain(地形) with steep valleys, and a lack of road access, the local government said in a statement on Monday.
A.whose the cause B.the cause of it C.of which the cause D.its cause
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