HOW MANY TIMES _______________ THERE SO FAR

6. - 500 CAU TRAC NGHIEM THI VAO LOP 6 MON TIENG ANH
500 CAU TRAC NGHIEM THI VAO LOP 6 MON TIENG ANH

6. How many times _______________ there so far? A few times.

A. have you been B. would you be C. were you D. had you been