问题
选择题
Ballet is amazing; _____ you go, you are likely to find yourself going again and again. [ ]
A. as
B. once
C. unless
D. while
答案
答案：B
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Ballet is amazing; _____ you go, you are likely to find yourself going again and again. [ ]
A. as
B. once
C. unless
D. while
答案：B