There is no doubt one who gets to the finishing line first will win the first prize.
A. that
B. whether
C. if
D. what
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(答案→)A. that
B. whether
C. if
D. what
解析：考察同位语从句。本题指的That引导的是同位语从句that one who gets to the finishing line first will win the first prize.对前面的名词no doubt进行解释说明。因为no doubt毫无疑问，是一个确定的事实，故使用that引导。也有人把这个句式理解成是固定句式There is no doubt that…毫无疑问…；故A正确。