If the operation______carefully prepared，it would not have been successful.
A: was not
B: has not been
C: had not been
D: were not
A: was not
B: has not been
C: had not been
D: were not
举一反三
- Only time will tell if we （） A: had been succeeded B: have been success C: had been successful D: have been successful
- He must have had an accident, or he_____ here then. A: were B: would be C: would have been D: had been
- If he _______ in better health, he ________ abroad to study. ( ) A: is…had been sent B: were, could be sent C: had been … would be sent D: had been, would have been sent
- If you______there yesterday, you would have seen her. A: were B: B. would have been C: were being D: had been
- I would have come sooner if I had known you there. A: be B: were C: had been D: would have been