The motorcycle competition in the desert, lasted ten days, is over now. A. it B. where C.

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A. it
B. where
(答案→)C. which
D. that
解析：定语从句考查题。先行词为petition关系词在从句中做主语要用which、that，而在非限制性定语从句中只能用which。句意：持续了十天的沙漠摩托比赛现在结束了。