In the past few years, a great many teachers have found       very important to teach their students how to learn.

In the past few years, a great many teachers have found       very important to teach their students how to learn.

In the past few years, a great many teachers have found       very important to teach their students how to learn.

1. A.
   this
2. B.
   that
3. C.
   one
4. D.
   it

In the past few years, a great many teachers have found ____ very important to teach their students how to learn.

　A. this　　　　　　　 B. that　　　　　　 C. it　　　　 D. one