JACK ______ WORKING OVERTIME FOR THE LAST THREE WEEKS.A. ISB. WASC....

4. - TÀI LIỆU TOEFL EXAM SUCCESS IN ONLY 6 STEP PART 6 PPT
TÀI LIỆU TOEFL EXAM SUCCESS IN ONLY 6 STEP PART 6 PPT

4. Jack ______ working overtime for the last three weeks.

a. is

b. was

c. has been

d. did