You may leave the classroom when you __________ writing.
A. will finish
B. are finishing
C. have finished
D. had finished
Chọn đáp án C
A: Do you know our town at all?
B: No. It is the first time I __________ here.
A: What’s the matter?
B: The shoes don’t fit properly. They __________ my feet.
A: How are you today?
B: Oh, I __________ as ill as I do now for a very long time.