Các bạn giúp mình chọn câu này với!!!! 39. I can’t help you unless you tell me what’s wrong. A. If you don’t tell me what’s wrong, I can’t help you. B. If you tell me what’s wrong, I can’t help you. C. If you don’t tell me what’s wrong, I can help you. D. If you tell me what’s wrong, I can help you.

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