问题
选择题
You _____ ask the teacher if you want to leave the classroom. [ ]
A. supposed that
B. are supposed to
C. are wanted
答案
答案：B
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You _____ ask the teacher if you want to leave the classroom. [ ]
A. supposed that
B. are supposed to
C. are wanted
答案：B
畸形的原因很多，其中不良习惯和替牙障碍在错