He was driving very fast because he didn't know the road was icy.

A. If he knew the road was icy, he wouldn't drive so fast.

B. He hadn't been driving very fast if he would have known the road was icy.

C. If he had known the road was icy, he wouldn't have been driving so fast.

D. He wasn't driving very fast if he would know the road was icy.

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