It's hard to believe that some old textbooks published ten years ago______in our university today.A.are using B.are being used C.have used D.were used
问题描述：
It's hard to believe that some old textbooks published ten years ago______in our university today.
A.are using B.are being used C.have used D.were used
答
B吧 令人难以置信的是,这些十年前出版的教科书在今天的大学中还在被使用.ARE BEING USED既表示被动也表示进行时.