【单选题】【消耗次数：1】
单击合成面板左下方的图标按钮( ) ，可以展开合成的图层面板。
①
Expand or collapse Transfer Controls panes
②
Expand or collapse In/Out/Duration/Stretch panes
③
Expand or collapse Layer Switches panes
④
Expand or collapse In/Out/ panes
参考答案：
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reliable
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