She ought to __________ my letter a week ago. But she was busy with her work at that time.
A: have answered
B: answering
C: answer
D: be answered
A: have answered
B: answering
C: answer
D: be answered
举一反三
- He avoid ( ) my questions. A: to answer B: answer C: answering D: answered
- I hoped ______ my letter. A: her to answer B: that she would answer C: that she answers D: her answering
- I have to delay（）the letter. A: to answer B: answering C: answer D: answered
- We still have a few more letters______. A: to be answered B: to answer C: to answering
- She ______ on her way to school．I just phoned her home and no one answered me． A: should be B: must be C: might have been D: could be