U
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I'm having trouble deciding between the following two sentences about which is right:
1. Had you not warned her beforehand, she would have made a mistake.
2. Hadn't you warned her beforehand, she would have made a mistake.
Thank you in advance.
1. Had you not warned her beforehand, she would have made a mistake.
2. Hadn't you warned her beforehand, she would have made a mistake.
Thank you in advance.