求助!有道英语习题不会做!the Greeks thought that the bones__griffin bones.A. can be B.mustn't be c.had to be D.must be答案是D,请分别解释各个选项!

有道习题不会做 求助!有道英语习题不会做!the Greeks thought that the bones__griffin bones.A. can be B.mustn't be c.had to be D.must be答案是D,请分别解释各个选项! 有道英语不会做 有道高一函数不会做求助 有道科学不会做 有道英语不会 求助英语高手,英语试题不会做 有道不会做,有道检查下, 有道科学题不会做 高一化学 不会做 求助 有道词典翻译会不会出现语法错误?英语作文不会做~想用有道翻译又怕出错 高一有道英语填空题不会做.Lily cried with t_____ when she saw the man with a knife in his hand . 有道数学题不会做,求解题过程! 好难不会做,求助 初二英语书上习题,求助啊 求助gre一道数学题,题意懂,但是不会做,The company at which Mark is employed has 80 employees,each of whom has a different salary.Mark’s salary of $43,700 is the second-highest salary in the first quartile of the 80 salaries.If the comp 新GRE数学题求助> 求助第四题不会做!谢谢