it is no doubt () he will win the frist prize A.which B.whether C.that D.what 为什么选C

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it is no doubt () he will win the frist prize A.which B.whether C.that D.what 为什么选C
it is no doubt () he will win the frist prize A.which B.whether C.that D.what 为什么选C

it is no doubt () he will win the frist prize A.which B.whether C.that D.what 为什么选C
因为后面的句子he will win the frist prize 里不缺少任何成分,所以用关系代词而不用其他关系副词.