题目内容

He failed the mid-term exam and only then ______ how much time he had wasted.

   A. he realized              B. did he realize          

   C. he had realized       D. had he realized

练习册系列答案
相关题目

违法和不良信息举报电话:027-86699610 举报邮箱:58377363@163.com

精英家教网