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【多选题】
使用遮罩制作动效有几种方法A.
使用矩形工具绘制遮罩
B.
选中所要制作动效的图层，然后在该图层上使用绘制工具绘制遮罩
C.
在所要制作动效的图层上方制作一个图层，并在要制作动效的图层上使用图层蒙版中的选项制作
D.
以上都对
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A.
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B.
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A.
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B.
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