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

19.______dog was the first animal to be domesticated is generally agreed upon byauthorities in the field.A)until theB)it was theC)theD)that the请问答案为什么选择D,请帮我详细的解答,谢谢~ When the police arrived at the scene,the victim was already____(die)There is a ______dog lying in the doorway.(die) 选用正确的冠词填空.1,look!______little dog is under my desk .______dog is my uncle is.2.can you give me _____apple?3.there is _____i and ______t in the word it.4._____ girl in red is my sister.5.______ moom turns around the earth. 选择适当的词填在很横线内（只填序号）1.brightest 2.hungry 3.peach 4.socks 5.supper 6.clean 7.photos(1)a ______dog ______ （2）three_________trees______(3)take off your _____ ______(4)the _______ light______(5)have _____ _______ (6) “that was the year what was the present? the house was cleaned how was the fridge? which was against the The test was finished. she was in the where was the thing? was the plane The little girl was The day was the dragon was made the focus.was when the boy was