问题
选择题
________ you are out of this hotel, your life will be in danger.[ ]
A. Once
B. Because
C. Unless
D. Though
答案
答案：A
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________ you are out of this hotel, your life will be in danger.[ ]
A. Once
B. Because
C. Unless
D. Though
答案：A
．缺失，5年前曾在诊所行
单端固定桥修复，现诉：
松动疼痛检查，