You（）him out though you were very busy.
A: could have helped
B: must help
C: should have helped
D: ought to help
A: could have helped
B: must help
C: should have helped
D: ought to help
举一反三
- I wished Iyou, but I was very busy then. A: can help B: could have helped C: to help D: helped
- Sorry not ______you, but you know I was terribly busy then. A: have helped B: help C: to have helped D: to be helping
- I wish I ______ you, but I don't know his phone number. A: can help B: can have helped C: could help D: could have helped
- I _____ them, but I wasn’t able to. A: ought to have helped B: must have helped C: might help D: needn’t have helped
- I regretted very much for _____ him get out of the trouble in time. A: not to help B: not having helped C: having not helped D: to not help