你填得很對(duì)!（is也行,但不能填was)
weigh ( 動(dòng)詞)有…重;重...
It weighs nearly 27 kilos (about 65 pounds)... 它重近27千克(約65磅).我說(shuō)的was是when he was born那前面也用過(guò)去時(shí)，但前面是the dog，而不是a dog.填was/ weighed哦，好吧，謝謝！那The dog weighs about 8 kilos when he is born.可以嗎The dog weighed about 8 kilos when he was born.這條狗出生時(shí)約8公斤。（用過(guò)去時(shí)）A dog weighs about 8 kilos when he is born.Dogs weigh about 8 kilos when they are born狗出生時(shí)約8公斤。表示泛指用不定冠詞+單數(shù)名詞或復(fù)數(shù)名詞（前不加冠詞）