问题

Why are your hands that dirty— Oh, I______ in the garden since we finished breakfast.
A:worked
B:was working
C:am working
D:have been working
B:was working
C:am working
D:have been working
正确答案是:
同类题型
What place is it—Haven’t you found out we ______backwhere we ______
Suddenly the small boy stopped and bentdown as if to _____ something.
Have you finished your homework __________— Yes, I’ve __________ finished it.
For holidays,many people visit the Great Barrier Reef__________the northeast coast of Australia.[ ]