I wonder how it that Chinese climbers successfully finished the torch relay on the Mount

I wonder how it that Chinese climbers successfully finished the torch relay on the Mount Qomolangma, where the air is so thin.
A. came out
B. came about
C. came over
D. came across

A. came out(答案→)B. came aboutC. came overD. came across解析：考查短语辨析。A.出版，发行B.发生C.过来，顺便来访；D.偶然遇到；被理解.句意：我想知道中国登山员是怎样做到在空气如此稀薄的喜马拉雅山完成火炬接力的。根据句意说明在如此艰巨的条件下中国登山员完成火炬接力这件事是怎么发生的，故B正确。

谢谢了

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