Liu Ming is said         abroad for one year before he came to teach in our school．

Liu Ming is said ________ abroad for one year before he came to teach in our school．

1. A.
   to have studied
2. B.
   to study
3. C.
   to be studying
4. D.
   to have been studying

Liu Ming is said         abroad for one year before he came to teach in our school．

A．to have studied                        B．to study

C．to be studying                         D．to have been studying

Liu Ming is said         abroad for one year before he came to teach in our school．