I didn’t go to bed early, so I didn’t wake up at 7.00.
A.If I went to bed early, I would wake up at 7.00.
B.If I had gone to bed early, I will wake up at 7.00.
C.If I went to bed early, I would have woken up at 7.00
D.Had I gone to bed early,I would have woken up at 7.00.