We ______ on it for many hours, but we have not yet reached any conclusion.
A: are being worked
B: are working
C: have been working
D: have been worked
A: are being worked
B: are working
C: have been working
D: have been worked
举一反三
- We()on it for many hours but we have not yet reached any concinsion. A: work B: have been worked C: have been working D: are working
- 4. We ________ on it for several hours but we have not yet reached any conclusion. A: A. work B: B. are working C: C. have been working D: D. have been worked
- We ________ on it for several hours but we have not yet reached any conclusion.
- Since I came to this school,I _____as a volunteer. A: have been working B: have be working C: have worked D: have being working
- By the end of July, I _____ in the lab for two years. A: would have been working B: have worked C: will have worked D: will have been working