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Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
At the hospital I was told that, ___________I gave up smoking immediately, my illness would get much worse.
A. except
B. unless
C. until
D. provided
At the hospital I was told that, ___________I gave up smoking immediately, my illness would get much worse.
A. except
B. unless
C. until
D. provided
Unless: nếu không (if...not)
Đáp án B.