Quite a few (experiment)（）tests have been done, but none of them could help to cure the patient.
举一反三
- Extensive tests have been ____ on the patient.
- Given more attention, the work（） A: had been better done B: will be done better C: was better done D: could have been better done
- We wish the work could ______ more quickly, but we'd had some difficulties in getting the right kind of supplies. A: have done B: have been done C: have been doing D: be done
- I have been to quite a few restaurants,but I can say this one is_______ .
- How come you could have forgotten ______ by them so generously.(help)