问题
选择题
According to the rules of our school, you may leave the classroom ____ you have the teacher's permission. [ ]
A. unless
B. on condition that
C. though
D. until
答案
答案：B
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According to the rules of our school, you may leave the classroom ____ you have the teacher's permission. [ ]
A. unless
B. on condition that
C. though
D. until
答案：B