BOT模式中，特许期的设定情况可以分为（）
A.固定特许期
B.单限定特许期
C.双限定特许期
D.浮动特许期
参考答案：B, C
苯乙酸酯
Little___________about her own safety,though she was in great danger herself. [ ]
A. did Rose care
B. Rose did care
C. Rose does care
D. does Rose care
