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The climbers _____ their ambition by reaching the summit of the mountain.

A. obtained  B. sustained  C. maintained  D. realized

D


解析:

realise sth. by doing sth. else通過做......來實現.......。

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C
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A. they had fallen only 500 feet down     B. of the ledge and the loose snow on it

C. of their strong bodies                 D. they were very good climbers

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