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【单选题】
Premiere 中，实现视频素材的倒放的方法（ ）A.
选择“速度/持续时间”命令，对话框里的“倒放速度”复选框
B.
利用工具面板里的“比率拉伸工具
C.
裁切素材，被分成两段的素材片段，前面的片段移动到后面，后面的片段移动到前面
D.
利用工具面板里的“滑动工具
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