- Has your friend completed his design? - Not yet. He on it last night. A. worked B. has worked C. i
- Has your friend completed his design?
- Not yet. He ________ on it last night.
A. worked B. has worked C. is working D. was working
在线课程D
- Has your friend completed his design?
- Not yet. He ________ on it last night.
A. worked B. has worked C. is working D. was working
在线课程D