–You speak very good Chinese.

  --Thanks. I _______ it for 4 years before I came to China.

  A. studied  B. study  C. was studying  D. had studied

–You speak very good Chinese.

--Thanks. I _______ it for 4 years before I came to China.

A. studied B. study C. was studying D. had studied

–You speak very good Chinese.

--Thanks. I _______ it for 4 years before I came to China.

A. studied B. study C. was studying D. had studied

–You speak very good Chinese.
--Thanks. I _______ it for 4 years before I came to China

1. A.
   studied
2. B.
   study
3. C.
   was studying
4. D.
   had studied

–You speak very good Chinese.

  --Thanks. I _______ it for 4 years before I came to China.

  A. studied  B. study  C. was studying  D. had studied