问题

_____you disturb her with these annoying questions just when she was busy cooking dinner?— Sorry, I _____that at that time. [ ]
A: Should; must not have done
B: Shall; may have done
C: Must; should do
D: Must; should not have done
B: Shall; may have done
C: Must; should do
D: Must; should not have done
正确答案是: