Frank ________ when he noticed a large packing case lying on the floor
A. had about to leave
B. is about to leave
C. has about to leave
D. was about to leave
Câu trả lời là: D là đáp án đúng
Bảng Công Thức Nguyên Hàm
Frank ________ when he noticed a large packing case lying on the floor
A. had about to leave
B. is about to leave
C. has about to leave
D. was about to leave
Câu trả lời là: D là đáp án đúng