There is no doubtone who gets to the finishing line first will win the first prize.A. that

问题补充：

There is no doubtone who gets to the finishing line first will win the first prize.

A. that

B. whether

C. if

D. what

答案：

(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。