问题
选择题
It doesn't matter____you fail the exam. Keep on studying hard, and then you will succeed in the end. [ ]
A. before
B. unless
C. if
D. until
答案
答案：C
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It doesn't matter____you fail the exam. Keep on studying hard, and then you will succeed in the end. [ ]
A. before
B. unless
C. if
D. until
答案：C