I didn’t know that Lam had to get up early, so I didn’t wake him.
A.If I had known that Lam had to get up early, I would have woken him up.
B.If I know that Lam have to get up early, I will wake him up.
C.If I knew that Lam had to get up early, I would wake him up.
D.If I knew that Lam had to get up early, I would have woken him up.

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