He once worked in a company,     he went abroad for further study.

     A. from which   B. after that    C. from this    D. after which

He once worked in a company, ______ he went abroad for further study.

A. from which　　 B. after that　　 C. after which　　　 D. from this

He once worked in a company, ________ he went abroad for further study.

1. A.
   from which
2. B.
   after that
3. C.
   from this
4. D.
   after which

He once worked in a company, _____ he went abroad for further study.

       A．from which      B．after that   C．after which      D．from this