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If I had known the reason why she was absent from class, I would have told you.
A. I knew the reason why she was absent from class, but I didn’t tell you.
B. Unless I knew the reason why she was absent from class, I wouldn’t tell you.
C. I didn’t know the reason why she was absent from class, so I didn’t tell.
D. Although I knew the reason why she was absent from class, I didn’t tell you.
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