Liu Xiang's Olympic dreams were shattered（破灭）forsecond time when he unfortunatelycrashed a

Liu Xiang's Olympic dreams were shattered（破灭）for second time when he unfortunatelycrashed at first barrier in the ll0m hurdles heats in London．
A. the; the
B. a; a
C. a; the
D. the; a

A. the; theB. a; a(答案→)C. a; theD. the; a解析：考查冠词：第一空填a，a second time泛指“再一次”，第二空填the，特指第一个障碍，句意：当刘翔在伦敦110米栏的第一个障碍跌倒的时候，他的奥运梦再一次破灭了。选C。

就是这个解释