LCD显示器在显示动画时有拖尾现象，（）指标比较低。
A、亮度
B、对比度
C、响应时间
D、刷新率
参考答案：A, B, C
______ the programme, they have to stay there for another two weeks. [ ]
A. Not completing
B. Not completed
C. Not having completed
D. Having not completed
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