问题
选择题
It is known to all that ______ you exercise regularly, you won't stay in good health. [ ]
A. unless
B. if
C. until
D. as
答案
答案：A
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It is known to all that ______ you exercise regularly, you won't stay in good health. [ ]
A. unless
B. if
C. until
D. as
答案：A
