It was because of hard training the sportsman won the gold medal in the petition．
A. how
B. that
C. why
D. which
网友回答
A. how
(答案→)B. that
C. why
D. which
解析：考查强调句。强调句结构为it is /was + 强调部分 + that从句，本题强调介词短语because of hard training，故选B。句意：是因为艰苦的训练，运动员在比赛中获得金牌。