Nobody knew what this guy ______ all these years.
A: had been doing
B: have being doing
C: was doing
D: has been doing
A: had been doing
B: have being doing
C: was doing
D: has been doing
举一反三
- 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
- I shall tell you what he ____at three o’clock yesterday afternoon. A: has done B: has been done C: had been doing D: was doing
- I shall tell you what he （） at three o’clock yesterday afternoon. A: was doing B: did C: had been doing D: has done
- Hi! (好久不见). What have you been doing?
- 19. What have you been doing ________? (recent)