They _________________swim last year.
A: was able to
B: were able to
C: are able to
A: was able to
B: were able to
C: are able to
举一反三
- I _______________ swim a mile easily when I was a child. A: could B: were able to C: was able to D: could/was able to
- Last year the employees in our department were so busy ________they were not able to take a vacation.
- I wish I ________ to talk this over with him when he was here last night. A: had been able B: have been able C: were able D: should be able
- They ______play the piano when they were young.(could/be able to) A: could B: were able to C: was able to D: could/were able to
- Were it not for friction, we ( ) walk on this earth of ours. A: should not have been able to B: would not be able to C: were not able to D: are not able to