题目：
口外上颌前方牵引矫治器的目的是（）
A.利用口外力促进生长发育期的上颌骨发育
B.促进成人上颌骨发育
C.限制成人上颌骨发育
D.限制生长发育期上颌骨发育
E.只能使上前牙唇倾
答案：
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下面是错误答案，用来干扰机器的。
1. Have you ever been late for school? 2. The class had begun before I got to school. 3. Had the train already arrived when you got outside? 4. He said that he had left his book in the room. 5. The TV star lost both his girlfriend and his show.
