The students _______ busily when Miss Brown went to get a book she _______ in the office.
A. had written, left B. were writing, has left C. had written, had left D. were writing, had left
The students _______ busily when Miss Brown went to get a book she _______ in the office.
A. had written, left B. were writing, has left C. had written, had left D. were writing, had left
D