___ you been waiting long?
About this question
This question belongs to "Thì hiện tại hoàn thành tiếp diễn - Present Perfect Continuous Tense" on Học Mỗi Ngày. Review the answer, solution, and related items in the same set to study more effectively.
Question detail
___ you been waiting long?
A
Have
B
Has
C
Do
D
Are