he took part in the petition, he won a second prize.
A. The first time
B. For the first time
C. At a time
D. At one time
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(答案→)A. The first time
B. For the first time
C. At a time
D. At one time
解析:考查连词短语。根据句子结构可知需要用连词短语the first time第一次,其它选项作状语,选A。