以下哪一项不是急性化脓性中耳炎的主要临床表现（）。
A.耳鸣
B.耳漏
C.耳聋
D.眩晕
E.视矇
参考答案：E
You _____ if you had spoken the truth out. But you were as quiet as a mouse. [ ]
A. mustn't have been blamed
B. shouldn't be blamed
C. wouldn't have been blamed
D. couldn't be blamed
下列Flash中的图层类型中，（）是不能通过时间轴面板左侧的图层显示区中的按钮直接创建。
A、引导层
B、遮罩层
C、普通层
D、以上都不是
