By the time you arrive， I ________ working for two hours．
A: will be
B: can
C: will have been
D: have been
A: will be
B: can
C: will have been
D: have been
举一反三
- --- "You seem to be a secretary." - " ____________ . I have been working as a secretary for two years."
- 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
- They have been _ outsider for two hours.
- 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
- By the time your plane lands tonight, I _____ at the airport for 3 hours. A: had waited B: have been waited C: had been waiting D: will have been waiting