Why dinosaurs died out remains a puzzle.

dinosaurs died out years ago 同义句 no one has __ a convincing explanation of why dinosaurs died Dinosaurs hace completely died out on the earth,never____aga Dinosaurs died out on the earth等于什么 高一英语题求解,怎么写?求答案,答得好加悬赏,谢谢 1.Why dinosaurs died out suddenly That remains is a puzzle to me中remains是什么词性? 为什么 remains 后面没有 is That remains a puzzle to me.　对我来说,那是一个残余 No one can give us an exact ___ of why dinosaurs all died su 初一英语题1.Dinosaurs all died out suddenly.（改为一般疑问句） ____ dinosa 英语翻译1:The dinosaurs died out millions of years ago2:By the t That remains is a puzzle to me帮我分析下句子结构 puzzle out与puzzle over的区别