[ Conditional Sentence ]
Unless you promise not to tell anyone, I won’t give you this letter
A. If you promise not to tell anyone, I will give you this letter.
B. If you don’t promise to tell anyone, I will give you this letter.
C. If you don’t promise to tell anyone, I won’t give you this letter.
D. If you promise not to tell anyone, I won’t give you this letter.

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A. carrying
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