启教通信息平台
  首页 / 试题 / 高中英语 / 试题详细
  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1361

________ on ten years of observation and study, Professor Wang announced that everyone dreams every night,whether they realize it or not.

A.Basing B.Based
C.Been based D.Having based
登录并查看解析

________ on ten years of obser