优题课 - 聚名师,上好课(www.youtike.com)
  首页 / 试题 / 高中英语 / 试题详细
  • 科目:英语
  • 题型:单选题
  • 难度:较易
  • 人气:1242

. I just don't understand_____________ that prevents so many Americans from being as happy as one might expect.

A.why it does B.what it does
C.what it is D.why it is
登录免费查看答案和解析

.Ijustdontunderstandthatpreven