Robert is said _______abroad, but I don’t know country be studied in .

A. to have studied   B. to study  C. to be study   D to have been studying

Robert is said _______abroad, but I don’t know country be studied in .

   A. to have studied   B. to study   C. to be study    D to have been studying

Robert is said _______abroad, but I don’t know country be studied in .
A. to have studied   B. to study  C. to be study   D to have been studying

Robert is said ________ abroad, but I don't know what country he studied in．

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

Robert is said _______ abroad, but I don’t know what country he studied in.

A. to have studied  B. to study

C. to be studying    D. to have been studying