He was admitted into Beijing University and years of his hard work ________ eventually．

1. A.
   paid off
2. B.
   were paid off
3. C.
   had paid off
4. D.
   had been paid off

He was admitted into Beijing University and years of his hard work ____ eventually．

　 A．paid off　 B．were paid off 　　　　 C．had paid off D．had been paid off

He was admitted into Beijing University and years of his hard work ____ eventually．

　 A．paid off　 B．were paid off 　　　　 C．had paid off D．had been paid off

He was admitted into Beijing University and years of his hard work ____ eventually．

　 A．paid off　 　 B．were paid off C．had paid off D．had been paid off