37. 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. If he had known the road was icy, he wouldn't have been driving so fast.
C. He wasn't driving very fast ifhe would know the road was icy.
D. He hadn't been driving very fast ifhe ould have known the road was icy.
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