Had they not helped us, our experiment _______________.
A: had failed
B: would have failed
C: failed
D: have failed
A: had failed
B: would have failed
C: failed
D: have failed
举一反三
- If I had not studied hard, I ______ in the exam. A: had failed B: would failed C: would have failed D: have failed
- Many a student ____ in the exam. A: have failed B: had been failed C: has failed D: will be failed
- Thank you for giving me a hand. I ______ in the experiment without your valuable help. A: have failed B: will fail C: would have failed D: must have failed
- I’m surprised that he _______ in the match. A: should fail B: should have failed C: would have failed D: may have failed
- ______, the man would not give in. A: Though had been failed B: Though having been failed C: Though failed D: Though being failed