—Why did you leave without a word of warning to John?
—But what _____ otherwise? He never listens to me.

—Why did you leave without a word of warning to John?

—But what _____ otherwise? He never listens to me.

A．could I have done                       B．would I do

C．must I have done                        D．should I do

—Why did you leave without a word of warning to John?

—But what           otherwise? He never listens to me.

    A．could I have done                    B．would I do

    C．must I have done                 D．should I do

—Why did you leave without a word of warning to John?
—But what _____ otherwise? He never listens to me.

1. A.
   could I have done
2. B.
   would I do
3. C.
   must I have done
4. D.
   should I do