We ______________ (work) on it for many hours but we haven't reached any conclusion yet.
举一反三
- We ________ the problem for quite some time, but we ________ any conclusion yet. A: have been discussing; haven’t reached B: have discussed; haven’t been reaching C: discussed; haven’t reached D: had discussed; haven’t reached
- 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
- We ________ on it for several hours but we have not yet reached any conclusion.
- 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
- 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