单项选择题

If I had taken the doctor's advice and rested for a few days, I should have completely recovered by now.

A.如果我能听医生的话,休息几日,早就应该完全康复了。
B.只要我肯听医生的建议,休息几天,就一定能够完全康复。
C.假如我听医生的劝告,歇息几天,我应该现在就已经完全康复。
D.要是我听了医生的劝告,休息几天,现在就能完全康复了。