19.______dog was the first animal to be domesticated is gene

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19.______dog was the first animal to be domesticated is generally agreed upon byauthorities in the field.
A)until the
B)it was the
C)the
D)that the
请问答案为什么选择D,请帮我详细的解答,谢谢~

这个表示：狗狗是第一种被驯养的动物
a until 表示直到……这里不符合句意
b it was the 这个句子已经倒装,后面有谓语动词was所以前面不需要了
c the 单用the缺少成分
所以选择D That在这里指代这个事情

19.______dog was the first animal to be domesticated is gene that the dog was the first animal to be domesticated is gene It is the first park in the world that was made to be seen a pmoA gene Special emphasis was given to the counting advanta sent Russian animal the space first into(.) is the ringging He was the first to the first thing to be mentioned is that 例句 Luo Xuejuan was very proud that she was s( ) to be the first This animal is to be found only in the Southern Hemisphere. be introduced,in domesticated form, It was for the first time that he------to the party.A had be She was the first woman to be appointed ________ the board.