Chinese exports have been hit hard by falling world demand, with millions of workers _______ to their villages after the factories that employed them closed down.

Chinese exports have been hit hard by falling world demand, with millions of workers _______ to their villages after the factories that employed them closed down.

A. returned　　　 B. returning　　　　　　 C. have returned　　 　 D. return

Chinese exports have been hit hard by falling world demand, with millions of workers _______ to their villages after the factories that employed them closed down.

1. A.
   returned
2. B.
   returning
3. C.
   have returned
4. D.
   return

 Chinese exports have been hit hard by falling world demand, with millions of workers _______ to their villages after the factories that employed them closed down.

A. returned              B. returning                     C. have returned      D. return

 Chinese exports have been hit hard by falling world demand, with millions of workers _______ to their villages after the factories that employed them closed down.

A. returned              B. returning                     C. have returned      D. return