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
A: have been working
B: have be working
C: have worked
D: have being working
举一反三
- 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
- I am tired. I ______ all day. A: am working B: have been working C: worked D: have been worked
- By the end of next month I ______ here for five years. A: will work B: have been working C: have worked D: will have been working
- I ______ in the school since 2001. A: work B: worked C: am working D: have worked
- 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