I'm sorry for what I_____________.
A: do
B: did
C: have done
D: am doing
A: do
B: did
C: have done
D: am doing
举一反三
- I’ll go to the classroom as soon as I finish what I _____. A: am doing B: was doing C: am done D: have done
- I won’t leave until I ____ my work. A: do B: did C: am doing D: have done
- I’m sorry, but I had no alternative. I simply ______ what I did. A: must do B: had to do C: ought to have done D: have to do
- I'm awfully sorry, but I had no alternative. I simply () what I did. A: ought to have done B: have to do C: had to do D: must do
- I'll go to the library as soon as I finish what I ______. A: was doing B: am doing C: have done D: had been doing